San Diego is a city in the U. S. state of California. It is in San Diego County, on the coast of the Pacific Ocean in Southern California 120 miles south of Los Angeles and adjacent to the border with Mexico. With an estimated population of 1,419,516 as of July 1, 2017, San Diego is the eighth-largest city in the United States and second-largest in California, it is part of the San Diego–Tijuana conurbation, the second-largest transborder agglomeration between the U. S. and a bordering country after Detroit–Windsor, with a population of 4,922,723 people. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches, long association with the United States Navy, recent emergence as a healthcare and biotechnology development center. San Diego has been called "the birthplace of California". Home to the Kumeyaay people, it was the first site visited by Europeans on what is now the West Coast of the United States. Upon landing in San Diego Bay in 1542, Juan Rodríguez Cabrillo claimed the area for Spain, forming the basis for the settlement of Alta California 200 years later.
The Presidio and Mission San Diego de Alcalá, founded in 1769, formed the first European settlement in what is now California. In 1821, San Diego became part of the newly independent Mexico, which reformed as the First Mexican Republic two years later. California became part of the United States in 1848 following the Mexican–American War and was admitted to the union as a state in 1850; the city is the seat of San Diego County and is the economic center of the region as well as the San Diego–Tijuana metropolitan area. San Diego's main economic engines are military and defense-related activities, international trade, manufacturing; the presence of the University of California, San Diego, with the affiliated UCSD Medical Center, has helped make the area a center of research in biotechnology. The original inhabitants of the region are now known as the San La Jolla people; the area of San Diego has been inhabited by the Kumeyaay people. The first European to visit the region was explorer Juan Rodríguez Cabrillo, sailing under the flag of Castile but born in Portugal.
Sailing his flagship San Salvador from Navidad, New Spain, Cabrillo claimed the bay for the Spanish Empire in 1542, named the site "San Miguel". In November 1602, Sebastián Vizcaíno was sent to map the California coast. Arriving on his flagship San Diego, Vizcaíno surveyed the harbor and what are now Mission Bay and Point Loma and named the area for the Catholic Saint Didacus, a Spaniard more known as San Diego de Alcalá. On November 12, 1602, the first Christian religious service of record in Alta California was conducted by Friar Antonio de la Ascensión, a member of Vizcaíno's expedition, to celebrate the feast day of San Diego. Permanent colonization of California and of San Diego began in 1769 with the arrival of four contingents of Spaniards from New Spain and the Baja California peninsula. Two seaborne parties reached San Diego Bay: the San Carlos, under Vicente Vila and including as notable members the engineer and cartographer Miguel Costansó and the soldier and future governor Pedro Fages, the San Antonio, under Juan Pérez.
An initial overland expedition to San Diego from the south was led by the soldier Fernando Rivera and included the Franciscan missionary and chronicler Juan Crespí, followed by a second party led by the designated governor Gaspar de Portolà and including the mission president Junípero Serra. In May 1769, Portolà established the Fort Presidio of San Diego on a hill near the San Diego River, it was the first settlement by Europeans in. In July of the same year, Mission San Diego de Alcalá was founded by Franciscan friars under Serra. By 1797, the mission boasted the largest native population in Alta California, with over 1,400 neophytes living in and around the mission proper. Mission San Diego was the southern anchor in Alta California of the historic mission trail El Camino Real. Both the Presidio and the Mission are National Historic Landmarks. In 1821, Mexico won its independence from Spain, San Diego became part of the Mexican territory of Alta California. In 1822, Mexico began its attempt to extend its authority over the coastal territory of Alta California.
The fort on Presidio Hill was abandoned, while the town of San Diego grew up on the level land below Presidio Hill. The Mission was secularized by the Mexican government in 1834, most of the Mission lands were granted to former soldiers; the 432 residents of the town petitioned the governor to form a pueblo, Juan María Osuna was elected the first alcalde, defeating Pío Pico in the vote. However, San Diego had been losing population throughout the 1830s and in 1838 the town lost its pueblo status because its size dropped to an estimated 100 to 150 residents. Beyond town Mexican land grants expanded the number of California ranchos that modestly added to the local economy. Americans gained increased awareness of California, its commercial possibilities, from the writings of two countrymen involved in the officially forbidden, to foreigners, but economically significant hide and tallow trade, where San Diego was a major port and the only one with an adequate harbor: William Shaler's "Journal of a Voyage Between China and the North-Western Coast of America, Made in 1804" and Richard Henry Dana's more substantial and convincing account, of his 1834–36 voyage, the classic Two Years Before the Mast.
In 1846, the United States went to war against Mexico and sent a naval and land expedition to conquer Alta California. At firs
Geometry is a branch of mathematics concerned with questions of shape, relative position of figures, the properties of space. A mathematician who works in the field of geometry is called a geometer. Geometry arose independently in a number of early cultures as a practical way for dealing with lengths and volumes. Geometry began to see elements of formal mathematical science emerging in the West as early as the 6th century BC. By the 3rd century BC, geometry was put into an axiomatic form by Euclid, whose treatment, Euclid's Elements, set a standard for many centuries to follow. Geometry arose independently in India, with texts providing rules for geometric constructions appearing as early as the 3rd century BC. Islamic scientists expanded on them during the Middle Ages. By the early 17th century, geometry had been put on a solid analytic footing by mathematicians such as René Descartes and Pierre de Fermat. Since and into modern times, geometry has expanded into non-Euclidean geometry and manifolds, describing spaces that lie beyond the normal range of human experience.
While geometry has evolved throughout the years, there are some general concepts that are more or less fundamental to geometry. These include the concepts of points, planes, surfaces and curves, as well as the more advanced notions of manifolds and topology or metric. Geometry has applications to many fields, including art, physics, as well as to other branches of mathematics. Contemporary geometry has many subfields: Euclidean geometry is geometry in its classical sense; the mandatory educational curriculum of the majority of nations includes the study of points, planes, triangles, similarity, solid figures and analytic geometry. Euclidean geometry has applications in computer science and various branches of modern mathematics. Differential geometry uses techniques of linear algebra to study problems in geometry, it has applications in physics, including in general relativity. Topology is the field concerned with the properties of geometric objects that are unchanged by continuous mappings. In practice, this means dealing with large-scale properties of spaces, such as connectedness and compactness.
Convex geometry investigates convex shapes in the Euclidean space and its more abstract analogues using techniques of real analysis. It has close connections to convex analysis and functional analysis and important applications in number theory. Algebraic geometry studies geometry through the use of multivariate polynomials and other algebraic techniques, it has applications including cryptography and string theory. Discrete geometry is concerned with questions of relative position of simple geometric objects, such as points and circles, it shares many principles with combinatorics. Computational geometry deals with algorithms and their implementations for manipulating geometrical objects. Although being a young area of geometry, it has many applications in computer vision, image processing, computer-aided design, medical imaging, etc; the earliest recorded beginnings of geometry can be traced to ancient Mesopotamia and Egypt in the 2nd millennium BC. Early geometry was a collection of empirically discovered principles concerning lengths, angles and volumes, which were developed to meet some practical need in surveying, construction and various crafts.
The earliest known texts on geometry are the Egyptian Rhind Papyrus and Moscow Papyrus, the Babylonian clay tablets such as Plimpton 322. For example, the Moscow Papyrus gives a formula for calculating the volume of a truncated pyramid, or frustum. Clay tablets demonstrate that Babylonian astronomers implemented trapezoid procedures for computing Jupiter's position and motion within time-velocity space; these geometric procedures anticipated the Oxford Calculators, including the mean speed theorem, by 14 centuries. South of Egypt the ancient Nubians established a system of geometry including early versions of sun clocks. In the 7th century BC, the Greek mathematician Thales of Miletus used geometry to solve problems such as calculating the height of pyramids and the distance of ships from the shore, he is credited with the first use of deductive reasoning applied to geometry, by deriving four corollaries to Thales' Theorem. Pythagoras established the Pythagorean School, credited with the first proof of the Pythagorean theorem, though the statement of the theorem has a long history.
Eudoxus developed the method of exhaustion, which allowed the calculation of areas and volumes of curvilinear figures, as well as a theory of ratios that avoided the problem of incommensurable magnitudes, which enabled subsequent geometers to make significant advances. Around 300 BC, geometry was revolutionized by Euclid, whose Elements considered the most successful and influential textbook of all time, introduced mathematical rigor through the axiomatic method and is the earliest example of the format still used in mathematics today, that of definition, axiom and proof. Although most of the contents of the Elements were known, Euclid arranged them into a single, coherent logical framework; the Elements was known to all educated people in the West until the middle of the 20th century and its contents are still taught in geometry classes today. Archimedes of Syracuse used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, gave remarkably accurate approximations of Pi.
He studied the sp
The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
Mathematics includes the study of such topics as quantity, structure and change. Mathematicians use patterns to formulate new conjectures; when mathematical structures are good models of real phenomena mathematical reasoning can provide insight or predictions about nature. Through the use of abstraction and logic, mathematics developed from counting, calculation and the systematic study of the shapes and motions of physical objects. Practical mathematics has been a human activity from as far back; the research required to solve mathematical problems can take years or centuries of sustained inquiry. Rigorous arguments first appeared in Greek mathematics, most notably in Euclid's Elements. Since the pioneering work of Giuseppe Peano, David Hilbert, others on axiomatic systems in the late 19th century, it has become customary to view mathematical research as establishing truth by rigorous deduction from appropriately chosen axioms and definitions. Mathematics developed at a slow pace until the Renaissance, when mathematical innovations interacting with new scientific discoveries led to a rapid increase in the rate of mathematical discovery that has continued to the present day.
Mathematics is essential in many fields, including natural science, medicine and the social sciences. Applied mathematics has led to new mathematical disciplines, such as statistics and game theory. Mathematicians engage in pure mathematics without having any application in mind, but practical applications for what began as pure mathematics are discovered later; the history of mathematics can be seen as an ever-increasing series of abstractions. The first abstraction, shared by many animals, was that of numbers: the realization that a collection of two apples and a collection of two oranges have something in common, namely quantity of their members; as evidenced by tallies found on bone, in addition to recognizing how to count physical objects, prehistoric peoples may have recognized how to count abstract quantities, like time – days, years. Evidence for more complex mathematics does not appear until around 3000 BC, when the Babylonians and Egyptians began using arithmetic and geometry for taxation and other financial calculations, for building and construction, for astronomy.
The most ancient mathematical texts from Mesopotamia and Egypt are from 2000–1800 BC. Many early texts mention Pythagorean triples and so, by inference, the Pythagorean theorem seems to be the most ancient and widespread mathematical development after basic arithmetic and geometry, it is in Babylonian mathematics that elementary arithmetic first appear in the archaeological record. The Babylonians possessed a place-value system, used a sexagesimal numeral system, still in use today for measuring angles and time. Beginning in the 6th century BC with the Pythagoreans, the Ancient Greeks began a systematic study of mathematics as a subject in its own right with Greek mathematics. Around 300 BC, Euclid introduced the axiomatic method still used in mathematics today, consisting of definition, axiom and proof, his textbook Elements is considered the most successful and influential textbook of all time. The greatest mathematician of antiquity is held to be Archimedes of Syracuse, he developed formulas for calculating the surface area and volume of solids of revolution and used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, in a manner not too dissimilar from modern calculus.
Other notable achievements of Greek mathematics are conic sections, trigonometry (Hipparchus of Nicaea, the beginnings of algebra. The Hindu–Arabic numeral system and the rules for the use of its operations, in use throughout the world today, evolved over the course of the first millennium AD in India and were transmitted to the Western world via Islamic mathematics. Other notable developments of Indian mathematics include the modern definition of sine and cosine, an early form of infinite series. During the Golden Age of Islam during the 9th and 10th centuries, mathematics saw many important innovations building on Greek mathematics; the most notable achievement of Islamic mathematics was the development of algebra. Other notable achievements of the Islamic period are advances in spherical trigonometry and the addition of the decimal point to the Arabic numeral system. Many notable mathematicians from this period were Persian, such as Al-Khwarismi, Omar Khayyam and Sharaf al-Dīn al-Ṭūsī. During the early modern period, mathematics began to develop at an accelerating pace in Western Europe.
The development of calculus by Newton and Leibniz in the 17th century revolutionized mathematics. Leonhard Euler was the most notable mathematician of the 18th century, contributing numerous theorems and discoveries; the foremost mathematician of the 19th century was the German mathematician Carl Friedrich Gauss, who made numerous contributions to fields such as algebra, differential geometry, matrix theory, number theory, statistics. In the early 20th century, Kurt Gödel transformed mathematics by publishing his incompleteness theorems, which show that any axiomatic system, consistent will contain unprovable propositions. Mathematics has since been extended, there has been a fruitful interaction between mathematics and science, to
Ann Arbor, Michigan
Ann Arbor is a city in the U. S. state of Michigan and the county seat of Washtenaw County. The 2010 census recorded its population to be 113,934. Ann Arbor is home to the University of Michigan; the university shapes Ann Arbor's economy as it employs about 30,000 workers, including about 12,000 in the medical center. The city's economy is centered on high technology, with several companies drawn to the area by the university's research and development infrastructure. Ann Arbor was founded in 1824, named for wives of the village's founders, both named Ann, the stands of bur oak trees; the University of Michigan moved from Detroit to Ann Arbor in 1837, the city grew at a rapid rate in the early to mid-20th century. During the 1960s and 1970s, the city gained a reputation as a center for left-wing politics. Ann Arbor became a focal point for political activism, such as opposition to the Vietnam War and support for the legalization of cannabis. In about 1774, the Potawatomi founded two villages in the area of.
Ann Arbor was founded in 1824 by land speculators John Elisha Walker Rumsey. On May 25, 1824, the town plat was registered with Wayne County as "Annarbour", the earliest known use of the town's name. Allen and Rumsey decided to name it for their wives, both named Ann, for the stands of bur oak in the 640 acres of land they purchased for $800 from the federal government at $1.25 per acre. The local Ojibwa named the settlement kaw-goosh-kaw-nick, after the sound of Allen's sawmill. Ann Arbor became the seat of Washtenaw County in 1827, was incorporated as a village in 1833; the Ann Arbor Land Company, a group of speculators, set aside 40 acres of undeveloped land and offered it to the state of Michigan as the site of the state capital, but lost the bid to Lansing. In 1837, the property was accepted instead as the site of the University of Michigan, which moved from Detroit. Since the university's establishment in the city in 1837, the histories of the University of Michigan and Ann Arbor have been linked.
The town became a regional transportation hub in 1839 with the arrival of the Michigan Central Railroad, a north–south railway connecting Ann Arbor to Toledo and other markets to the south was established in 1878. Throughout the 1840s and the 1850s settlers continued to come to Ann Arbor. While the earlier settlers were of British ancestry, the newer settlers consisted of Germans and African-Americans. In 1851, Ann Arbor was chartered as a city, though the city showed a drop in population during the Depression of 1873, it was not until the early 1880s that Ann Arbor again saw robust growth, with new emigrants from Greece, Italy and Poland. Ann Arbor saw increased growth in manufacturing in milling. Ann Arbor's Jewish community grew after the turn of the 20th century, its first and oldest synagogue, Beth Israel Congregation, was established in 1916. During the 1960s and 1970s, the city gained a reputation as an important center for liberal politics. Ann Arbor became a locus for left-wing activism and anti-Vietnam War movement, as well as the student movement.
The first major meetings of the national left-wing campus group Students for a Democratic Society took place in Ann Arbor in 1960. S. teach-in against the Vietnam War. During the ensuing 15 years, many countercultural and New Left enterprises sprang up and developed large constituencies within the city; these influences washed into municipal politics during the early and mid-1970s when three members of the Human Rights Party won city council seats on the strength of the student vote. During their time on the council, HRP representatives fought for measures including pioneering antidiscrimination ordinances, measures decriminalizing marijuana possession, a rent-control ordinance. Alongside these liberal and left-wing efforts, a small group of conservative institutions were born in Ann Arbor; these include Word of a charismatic inter-denominational movement. Following a 1956 vote, the city of East Ann Arbor merged with Ann Arbor to encompass the eastern sections of the city. In the past several decades, Ann Arbor has grappled with the effects of rising land values and urban sprawl stretching into outlying countryside.
On November 4, 2003, voters approved a greenbelt plan under which the city government bought development rights on agricultural parcels of land adjacent to Ann Arbor to preserve them from sprawling development. Since a vociferous local debate has hinged on how and whether to accommodate and guide development within city limits. Ann Arbor ranks in the "top places to live" lists published by various mainstream media outlets every year. In 2008, it was ranked by CNNMoney.com 27th out of 100 "America's best small cities". And in 2010, Forbes listed Ann Arbor as one of the most liveable cities in the United States. According to the United States Census Bureau, the city has a total area of 28.70 square miles, of which, 27.83 square miles of it is land and 0.87 square miles is water, much of, part of the Huron River. Ann Arbor is about 35 miles west of Detroit. Ann Arbor Charter Township adjoins the city's north and east sides. Ann Arbor is situated on the Huron River in a productive fruit-growing region.
The landscape of Ann Arbor consists of hills and valleys, with the terrain becoming steeper near the Huron River. The elevation ranges from about 750 feet along the Huron River to 1,015 feet (309
Hungarians known as Magyars, are a nation and ethnic group native to Hungary and historical Hungarian lands who share a common culture and language. Hungarians belong to the Uralic-speaking peoples. There are an estimated 14.2–14.5 million ethnic Hungarians and their descendants worldwide, of whom 9.6 million live in today's Hungary. About 2.2 million Hungarians live in areas that were part of the Kingdom of Hungary before the Treaty of Trianon and are now parts of Hungary's seven neighbouring countries Slovakia, Romania, Croatia and Austria. Significant groups of people with Hungarian ancestry live in various other parts of the world, most of them in the United States, Germany, the United Kingdom, Brazil and Argentina. Hungarians can be classified into several subgroups according to local linguistic and cultural characteristics; the Hungarians' own ethnonym to denote themselves in the Early Middle Ages is uncertain. The exonym "Hungarian" is thought to be derived from Oghur-Turkic On-Ogur. Another possible explanation comes from the Old Russian "Yugra".
It may refer to the Hungarians during a time when they dwelt east of the Ural Mountains along the natural borders of Europe and Asia before their conquest of the Carpathian Basin. Prior to the Hungarian conquest of the Carpathian Basin in 895/6 and while they lived on the steppes of Eastern Europe east of the Carpathian Mountains, written sources called the Magyars "Hungarians", specifically: "Ungri" by Georgius Monachus in 837, "Ungri" by Annales Bertiniani in 862, "Ungari" by the Annales ex Annalibus Iuvavensibus in 881; the Magyars/Hungarians belonged to the Onogur tribal alliance, it is possible that they became its ethnic majority. In the Early Middle Ages, the Hungarians had many names, including "Węgrzy", "Ungherese", "Ungar", "Hungarus"; the "H-" prefix is a addition of Medieval Latin. The Hungarian people refer to themselves by the demonym "Magyar" rather than "Hungarian". "Magyar" is Finno-Ugric from the Old Hungarian "mogyër". "Magyar" derived from the name of the most prominent Hungarian tribe, the "Megyer".
The tribal name "Megyer" became "Magyar" in reference to the Hungarian people as a whole. "Magyar" may derive from the Hunnic "Muageris" or "Mugel". The Greek cognate of "Tourkia" was used by the scholar and Byzantine Emperor Constantine VII "Porphyrogenitus" in his De Administrando Imperio of c. AD 950, though in his use, "Turks" always referred to Magyars; this was a misnomer, as while the Magyars had adopted some Turkic cultural traits, they are not a Turkic people. The historical Latin phrase "Natio Hungarica" had a wider and political meaning because it once referred to all nobles of the Kingdom of Hungary, regardless of their ethnicity or mother tongue. During the 4th millennium BC, the Uralic-speaking peoples who were living in the central and southern regions of the Urals split up; some dispersed towards the west and northwest and came into contact with Iranian speakers who were spreading northwards. From at least 2000 BC onwards, the Ugrian speakers became distinguished from the rest of the Uralic community, of which the ancestors of the Magyars, being located farther south, were the most numerous.
Judging by evidence from burial mounds and settlement sites, they interacted with the Indo-Iranian Andronovo culture. In the 4th and 5th centuries AD, the Hungarians moved from the west of the Ural Mountains to the area between the southern Ural Mountains and the Volga River known as Bashkiria and Perm Krai. In the early 8th century, some of the Hungarians moved to the Don River to an area between the Volga and the Seversky Donets rivers. Meanwhile, the descendants of those Hungarians who stayed in Bashkiria remained there as late as 1241; the Hungarians around the Don River were subordinates of the Khazar khaganate. Their neighbours were the archaeological Saltov Culture, i.e. Bulgars and the Alans, from whom they learned gardening, elements of cattle breeding and of agriculture. Tradition holds; the names of the seven tribes were: Jenő, Kér, Keszi, Kürt-Gyarmat, Megyer, Nyék, Tarján. Around 830, a rebellion broke out in the Khazar khaganate; as a result, three Kabar tribes of the Khazars joined the Hungarians and moved to what the Hungarians call the Etelköz, the territory between the Carpathians and the Dnieper River.
The Hungarians faced their first attack by the Pechenegs around 854, though other sources state that an attack by Pechenegs was the reason for their departure to Etelköz. The new neighbours of the Hungarians were the eastern Slavs. From 862 onwards, the Hungarians along with their allies, the Kabars, started a series of looting raids from the Etelköz into the Carpathian Basin against the Eastern Frankish Empire and Great Moravia, but against the Balaton principality and Bulgaria. In 895/896, under the leadership of Árpád, some Hungarians crossed the Carpathians and entered the Carpathian Basin; the tribe called Magyar was the leading tribe of the Hungarian alliance that conquered the centre of the basin. At the same time, due to their involvement in the 894–896 Bulgaro-Byzantine war, Hungarians in Etelköz were attacked by Bulgaria and by their old enemies the Pechenegs; the Bulgarians won the decisive b
Czechoslovakia, or Czecho-Slovakia, was a sovereign state in Central Europe that existed from October 1918, when it declared its independence from the Austro-Hungarian Empire, until its peaceful dissolution into the Czech Republic and Slovakia on 1 January 1993. From 1939 to 1945, following its forced division and partial incorporation into Nazi Germany, the state did not de facto exist but its government-in-exile continued to operate. From 1948 to 1990, Czechoslovakia was part of the Eastern Bloc with a command economy, its economic status was formalized in membership of Comecon from 1949 and its defense status in the Warsaw Pact of May 1955. A period of political liberalization in 1968, known as the Prague Spring, was forcibly ended when the Soviet Union, assisted by several other Warsaw Pact countries, invaded. In 1989, as Marxist–Leninist governments and communism were ending all over Europe, Czechoslovaks peacefully deposed their government in the Velvet Revolution. In 1993, Czechoslovakia split into the two sovereign states of Slovakia.
Form of state1918 – 1938: A democratic republic championed by Tomáš Masaryk. 1938 – 1939: After annexation of Sudetenland by Nazi Germany in 1938, the region turned into a state with loosened connections among the Czech and Ruthenian parts. A large strip of southern Slovakia and Carpatho-Ukraine was annexed by Hungary, the Zaolzie region was annexed by Poland. 1939 – 1945: The region was split into the Protectorate of Bohemia and Moravia and the Slovak Republic. A government-in-exile continued to exist in London, supported by the United Kingdom, United States and their Allies. Czechoslovakia adhered to the Declaration by United Nations and was a founding member of the United Nations. 1946 – 1948: The country was governed by a coalition government with communist ministers, including the prime minister and the minister of interior. Carpathian Ruthenia was ceded to the Soviet Union. 1948 – 1989: The country became a socialist state under Soviet domination with a centrally planned economy. In 1960, the country became a socialist republic, the Czechoslovak Socialist Republic.
It was a satellite state of the Soviet Union. 1969 – 1990: The federal republic consisted of the Czech Socialist Republic and the Slovak Socialist Republic. 1990 – 1992: Following the Velvet Revolution, the state was renamed the Czech and Slovak Federal Republic, consisting of the Czech Republic and the Slovak Republic, reverted to a democratic republic. NeighboursAustria 1918 – 1938, 1945 – 1992 Germany Hungary Poland Romania 1918 – 1938 Soviet Union 1945 – 1991 Ukraine 1991 – 1992 TopographyThe country was of irregular terrain; the western area was part of the north-central European uplands. The eastern region was composed of the northern reaches of the Carpathian Mountains and lands of the Danube River basin. ClimateThe weather is mild summers. Influenced by the Atlantic Ocean from the west, Baltic Sea from the north, Mediterranean Sea from the south. There is no continental weather. 1918–1920: Republic of Czechoslovakia /Czecho-Slovak State, or Czecho-Slovakia/Czechoslovakia 1920–1938: Czechoslovak Republic, or Czechoslovakia 1938–1939: Czecho-Slovak Republic, or Czecho-Slovakia 1945–1960: Czechoslovak Republic, or Czechoslovakia 1960–1990: Czechoslovak Socialist Republic, or Czechoslovakia April 1990: Czechoslovak Federative Republic and Czecho-Slovak Federative Republic The country subsequently became the Czech and Slovak Federative Republic, or Československo and Česko-Slovensko.
The area was long a part of the Austro-Hungarian Empire until the empire collapsed at the end of World War I. The new state was founded by Tomáš Garrigue Masaryk, who served as its first president from 14 November 1918 to 14 December 1935, he was succeeded by his close ally, Edvard Beneš. The roots of Czech nationalism go back to the 19th century, when philologists and educators, influenced by Romanticism, promoted the Czech language and pride in the Czech people. Nationalism became a mass movement in the second half of the 19th century. Taking advantage of the limited opportunities for participation in political life under Austrian rule, Czech leaders such as historian František Palacký founded many patriotic, self-help organizations which provided a chance for many of their compatriots to participate in communal life prior to independence. Palacký supported Austro-Slavism and worked for a reorganized and federal Austrian Empire, which would protect the Slavic speaking peoples of Central Europe against Russian and German threats.
An advocate of democratic reform and Czech autonomy within Austria-Hungary, Masaryk was elected twice to the Reichsrat, first from 1891 to 1893 for the Young Czech Party, again from 1907 to 1914 for the Czech Realist Party, which he had founded in 1889 with Karel Kramář and Josef Kaizl. During World War I small numbers of Czechs, the Czechoslovak Legions, fought with the Allies in France and Italy, while large numbers deserted to Russia in exchange for its support for the independence of Czechoslovakia from the Austrian Empire. With the outbreak of World War I, Masaryk began working for Czech independence in a union with Slovakia. With Edvard Beneš and Milan Rastislav Štefánik, Masaryk visited several Western countries and won support from influential publicists. Bohemia and Moravi