Lumber or timber is a type of wood, processed into beams and planks, a stage in the process of wood production. Lumber is used for structural purposes but has many other uses as well. There are two main types of lumber, it may be surfaced on one or more of its faces. Besides pulpwood, rough lumber is the raw material for furniture-making and other items requiring additional cutting and shaping, it is available in many species hardwoods. Finished lumber is supplied in standard sizes for the construction industry – softwood, from coniferous species, including pine and spruce, hemlock, but some hardwood, for high-grade flooring, it is more made from softwood than hardwoods, 80% of lumber comes from softwood. In the United States milled boards of wood are referred to as lumber. However, in Britain and other Commonwealth nations, the term timber is instead used to describe sawn wood products, like floor boards. In the United States and Canada timber describes standing or felled trees. In Canada, lumber describes cut and surfaced wood.
In the United Kingdom, the word lumber is used in relation to wood and has several other meanings, including unused or unwanted items. Referring to wood, Timber is universally used instead. Remanufactured lumber is the result of secondary or tertiary processing/cutting of milled lumber, it is lumber cut for industrial or wood-packaging use. Lumber is cut by ripsaw or resaw to create dimensions that are not processed by a primary sawmill. Resawing is the splitting of 1-inch through 12-inch hardwood or softwood lumber into two or more thinner pieces of full-length boards. For example, splitting a ten-foot 2×4 into two ten-foot 1×4s is considered resawing. Structural lumber may be produced from recycled plastic and new plastic stock, its introduction has been opposed by the forestry industry. Blending fiberglass in plastic lumber enhances its strength and fire resistance. Plastic fiberglass structural lumber can have a "class 1 flame spread rating of 25 or less, when tested in accordance with ASTM standard E 84," which means it burns slower than all treated wood lumber.
Logs are converted into timber by being hewn, or split. Sawing with a rip saw is the most common method, because sawing allows logs of lower quality, with irregular grain and large knots, to be used and is more economical. There are various types of sawing: Plain sawn – A log sawn through without adjusting the position of the log and the grain runs across the width of the boards. Quarter sawn and rift sawn – These terms have been confused in history but mean lumber sawn so the annual rings are reasonably perpendicular to the sides of the lumber. Boxed heart – The pith remains within the piece with some allowance for exposure. Heart center – the center core of a log. Free of heart center – A side-cut timber without any pith. Free of knots – No knots are present. Dimensional lumber is lumber, cut to standardized width and depth, specified in inches. Carpenters extensively use dimensional lumber in framing wooden buildings. Common sizes include 2×4, 2×6, 4×4; the length of a board is specified separately from the width and depth.
It is thus possible to find 2×4s that are four and twelve feet in length. In Canada and the United States, the standard lengths of lumber are 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24 feet. For wall framing, "stud" or "precut" sizes are available, are used. For an eight-, nine-, or ten-foot ceiling height, studs are available in 92 5⁄8 inches, 104 5⁄8 inches, 116 5⁄8 inches; the term "stud" is used inconsistently to specify length. Under the prescription of the Method of Construction issued by the Southern Song government in the early 12th century, timbers were standardized to eight cross-sectional dimensions. Regardless of the actual dimensions of the timber, the ratio between width and height was maintained at 1:1.5. Units are in Song Dynasty inches. Timber smaller than the 8th class were called "unclassed"; the width of a timber is referred to as one "timber", the dimensions of other structural components were quoted in multiples of "timber". The dimensions of timbers in similar application show a gradual diminution from the Sui Dyansty to the modern era.
The length of a unit of dimensional lumber is limited by the height and girth of the tree it is milled from. In general the maximum length is 24 ft. Engineered wood products, manufactured by binding the strands, fibers, or veneers of wood, together with adhesives, to form composite materials, offer more flexibility and greater structural strength than typical wood building materials. Pre-cut studs save a framer much time, because they are pre-cut by the manufacturer for use in 8-, 9-
Metallurgy is a domain of materials science and engineering that studies the physical and chemical behavior of metallic elements, their inter-metallic compounds, their mixtures, which are called alloys. A special type of alloy was invented in 1995, when Taiwanese scientists invented the world's first high-entropy alloys of metals that can withstand the highest temperatures and pressures for use in industrial and technological applications such as state of the art race cars, submarines, nuclear reactors, jet airplanes, nuclear weapons, long range hypersonic missiles and many other areas of technology. Metallurgy is used to separate metals from their ore. Metallurgy is the technology of metals: the way in which science is applied to the production of metals, the engineering of metal components for usage in products for consumers and manufacturers; the production of metals involves the processing of ores to extract the metal they contain, the mixture of metals, sometimes with other elements, to produce alloys.
Metallurgy is distinguished from the craft of metalworking, although metalworking relies on metallurgy, as medicine relies on medical science, for technical advancement. The science of metallurgy is subdivided into physical metallurgy. Metallurgy is subdivided into ferrous metallurgy and non-ferrous metallurgy. Ferrous metallurgy involves processes and alloys based on iron while non-ferrous metallurgy involves processes and alloys based on other metals; the production of ferrous metals accounts for 95 percent of world metal production. The roots of metallurgy derive from Ancient Greek: μεταλλουργός, metallourgós, "worker in metal", from μέταλλον, métallon, "metal" + ἔργον, érgon, "work"; the word was an alchemist's term for the extraction of metals from minerals, the ending -urgy signifying a process manufacturing: it was discussed in this sense in the 1797 Encyclopædia Britannica. In the late 19th century it was extended to the more general scientific study of metals and related processes. In English, the pronunciation is the more common one in the Commonwealth.
The pronunciation is the more common one in the USA, is the first-listed variant in various American dictionaries. The earliest recorded metal employed by humans appears to be gold, which can be found free or "native". Small amounts of natural gold have been found in Spanish caves used during the late Paleolithic period, c. 40,000 BC. Silver, copper and meteoric iron can be found in native form, allowing a limited amount of metalworking in early cultures. Egyptian weapons made from meteoric iron in about 3000 BC were prized as "daggers from heaven". Certain metals, notably tin and copper, can be recovered from their ores by heating the rocks in a fire or blast furnace, a process known as smelting; the first evidence of this extractive metallurgy, dating from the 5th and 6th millennia BC, has been found at archaeological sites in Majdanpek and Plocnik, in present-day Serbia. To date, the earliest evidence of copper smelting is found at the Belovode site near Plocnik; this site produced a copper axe from 5500 BC.
The earliest use of lead is documented from the late neolithic settlement of Yarim Tepe in Iraq, "The earliest lead finds in the ancient Near East are a 6th millennium BC bangle from Yarim Tepe in northern Iraq and a later conical lead piece from Halaf period Arpachiyah, near Mosul. As native lead is rare, such artifacts raise the possibility that lead smelting may have begun before copper smelting." Copper smelting is documented at this site at about the same time period, although the use of lead seems to precede copper smelting. Early metallurgy is documented at the nearby site of Tell Maghzaliyah, which seems to be dated earlier, lacks pottery. Other signs of early metals are found from the third millennium BC in places like Palmela, Los Millares, Stonehenge. However, the ultimate beginnings cannot be ascertained and new discoveries are both continuous and ongoing. In the Near East, about 3500 BC, it was discovered that by combining copper and tin, a superior metal could be made, an alloy called bronze.
This represented a major technological shift known as the Bronze Age. The extraction of iron from its ore into a workable metal is much more difficult than for copper or tin; the process appears to have been invented by the Hittites in about 1200 BC. The secret of extracting and working iron was a key factor in the success of the Philistines. Historical developments in ferrous metallurgy can be found in a wide variety of past cultures and civilizations; this includes the ancient and medieval kingdoms and empires of the Middle East and Near East, ancient Iran, ancient Egypt, ancient Nubia, Anatolia, Ancient Nok, the Greeks and Romans of ancient Europe, medieval Europe and medieval China and medieval India and medieval Japan, amongst others. Many applications and devices associated or involved in metallurgy were established in ancient China, such as the innovation of the blast furnace, cast iron, hydraulic-powered trip hammers, double acting piston bellows. A 16th century book by Georg Agricola called De re metallica describes the developed and complex processes of mining metal ores, metal extraction and metallurgy of the time.
Agricola has been described as the "father of metallurgy". Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted
A machine is a mechanical structure that uses power to apply forces and control movement to perform an intended action. Machines can be driven by animals and people, by natural forces such as wind and water, by chemical, thermal, or electrical power, include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement, they can include computers and sensors that monitor performance and plan movement called mechanical systems. Renaissance natural philosophers identified six simple machines which were the elementary devices that put a load into motion, calculated the ratio of output force to input force, known today as mechanical advantage. Modern machines are complex systems that consist of structural elements and control components and include interfaces for convenient use. Examples include a wide range of vehicles, such as automobiles and airplanes, appliances in the home and office, including computers, building air handling and water handling systems, as well as farm machinery, machine tools and factory automation systems and robots.
The English word machine comes through Middle French from Latin machina, which in turn derives from the Greek. The word mechanical comes from the same Greek roots. A wider meaning of "fabric, structure" is found in classical Latin, but not in Greek usage; this meaning is found in late medieval French, is adopted from the French into English in the mid-16th century. In the 17th century, the word could mean a scheme or plot, a meaning now expressed by the derived machination; the modern meaning develops out of specialized application of the term to stage engines used in theater and to military siege engines, both in the late 16th and early 17th centuries. The OED traces the formal, modern meaning to John Harris' Lexicon Technicum, which has: Machine, or Engine, in Mechanicks, is whatsoever hath Force sufficient either to raise or stop the Motion of a Body... Simple Machines are reckoned to be Six in Number, viz. the Ballance, Pulley, Wheel and Screw... Compound Machines, or Engines, are innumerable.
The word engine used as a synonym both by Harris and in language derives from Latin ingenium "ingenuity, an invention". The hand axe, made by chipping flint to form a wedge, in the hands of a human transforms force and movement of the tool into a transverse splitting forces and movement of the workpiece; the idea of a simple machine originated with the Greek philosopher Archimedes around the 3rd century BC, who studied the Archimedean simple machines: lever and screw. Archimedes discovered the principle of mechanical advantage in the lever. Greek philosophers defined the classic five simple machines and were able to calculate their mechanical advantage. Heron of Alexandria in his work Mechanics lists five mechanisms that can "set a load in motion". However, the Greeks' understanding was limited to statics and did not include dynamics or the concept of work. During the Renaissance the dynamics of the Mechanical Powers, as the simple machines were called, began to be studied from the standpoint of how much useful work they could perform, leading to the new concept of mechanical work.
In 1586 Flemish engineer Simon Stevin derived the mechanical advantage of the inclined plane, it was included with the other simple machines. The complete dynamic theory of simple machines was worked out by Italian scientist Galileo Galilei in 1600 in Le Meccaniche, he was the first to understand that simple machines do not create energy, they transform it. The classic rules of sliding friction in machines were discovered by Leonardo da Vinci, but remained unpublished in his notebooks, they were rediscovered by Guillaume Amontons and were further developed by Charles-Augustin de Coulomb. James Watt patented his parallel motion linkage in 1782, which made the double acting steam engine practical; the Boulton and Watt steam engine and designs powered steam locomotives, steam ships, factories. The Industrial Revolution was a period from 1750 to 1850 where changes in agriculture, mining and technology had a profound effect on the social and cultural conditions of the times, it began in the United Kingdom subsequently spread throughout Western Europe, North America and the rest of the world.
Starting in the part of the 18th century, there began a transition in parts of Great Britain's manual labour and draft-animal-based economy towards machine-based manufacturing. It started with the mechanisation of the textile industries, the development of iron-making techniques and the increased use of refined coal; the idea that a machine can be decomposed into simple movable elements led Archimedes to define the lever and screw as simple machines. By the time of the Renaissance this list increased to include the wheel and axle and inclined plane; the modern approach to characterizing machines focusses on the components that allow movement, known as joints. Wedge: Perhaps the first example of a device designed to manage power is the hand axe called biface and Olorgesailie. A hand axe is made by chipping stone flint, to form a bifacial edge, or wedge. A wedge is a simple machine that transforms lateral force and movement o
Pernambuco is a state of Brazil, located in the Northeast region of the country. The state of Pernambuco includes the archipelago Fernando de Noronha. With an estimated population of 9.2 million people in 2013, it is the seventh most populous state of Brazil, is the sixth most densely populated and the 19th most extensive among the states and territories of the country. Its capital and largest city, Recife, is one of the most important economic and urban hubs in the country; as of 2013 estimates, Recife's metropolitan area is the fifth most populous in the country, the largest urban agglomeration in Northeast Brazil. In 1982, the city of Olinda, the second oldest city in Brazil, was declared a World Heritage Site by UNESCO. Recife, the state capital and Olinda have one of the most traditional Brazilian Carnivals. Both have architecture of Portugal, with centuries-old casarões and churches, kilometers of beaches and much culture; the proximity of the equator guarantees sunshine throughout the year, with average temperatures of 26 °C.
Pernambuco comprises a comparatively narrow coastal zone, a high inland plateau, an intermediate zone formed by the terraces and slopes between the two. Its surface is much broken by the remains of the ancient plateau, worn down by erosion, leaving escarpments and ranges of flat-topped mountains, called chapadas, capped in places by horizontal layers of sandstone. Ranges of these chapadas form the boundary lines with three states–the Serra dos Irmãos and Serra Vermelha with Piauí, the Serra do Araripe with Ceará, the Serra dos Cariris Velhos with Paraíba; the coastal area is fertile, was covered by the humid Pernambuco coastal forests, the northern extension of the Atlantic Forests of eastern Brazil. It is now placed to extensive sugar cane plantations, it has a humid climate, relieved to some extent by the south-east trade winds. The middle zone, called the agreste region, has a drier climate and lighter vegetation, including the semi-deciduous Pernambuco interior forests, where many trees lose their leaves in the dry season.
The inland region, called the sertão is high and dry, devastated by prolonged droughts. The climate is characterized by cool nights. There are two defined seasons, a rainy season from March to June, a dry season for the remaining months; the interior of the state is covered by the dry thorny scrub vegetation called caatinga. The Rio São Francisco is the main water source for this area; the climate is more mild in the countryside of the state because of the Borborema Plateau. Some towns are located more than 1000 meters above sea level, temperatures there can descend to 10 °C and 5 °C in some cities during the winter; the island of Fernando de Noronha in the Atlantic Ocean, 535 km northeast of Recife, has been part of Pernambuco since 1988. The rivers of the state include a number of small plateau streams flowing southward to the São Francisco River, several large streams in the eastern part flowing eastward to the Atlantic; the former are the Moxotó, Pajeú, Terra Nova, Boa Vista and Pontai, are dry channels the greater part of the year.
The largest of the coastal rivers are the Goiana River, formed by the confluence of the Tracunhaem and Capibaribe-mirim, drains a rich agricultural region in the north-east part of the state. A large tributary of the Uná, the Rio Jacuhipe, forms part of the boundary line with Alagoas. Inhabited by numerous tribes of Tupi-Guarani speaking indigenous peoples, Pernambuco was first settled by the Portuguese in the 16th century; the French under Bertrand d'Ornesan tried to establish a French trading post at Pernambuco in 1531. Shortly after King John III of Portugal created the Hereditary Captaincies in 1534, Pernambuco was granted to Duarte Coelho, who arrived in Nova Lusitânia in 1535. Duarte directed military actions against the French-allied Caetés Indians and upon their defeat in 1537 established a settlement at the site of a former Marin Indian village, henceforth known as Olinda, as well as another village at Igarassu. Due to the cultivation of sugar and cotton, Pernambuco was one of the few prosperous captaincies.
With the support of the Dutch West India Company, sugar mills were built and a sugar-based economy developed. In 1612, Pernambuco produced 14,000 tons of sugar. While the sugar industry relied at first on the labor of indigenous peoples the Tupis and Tapuyas, high mortality and economic growth led to the importation of enslaved Africans from the late 17th century; some of these slaves escaped the sugar-producing coastal regions and formed independent inland communities called mocambos, including Palmares. In 1630, Pernambuco, as well as many Portuguese possessions in Brazil, was occupied by the Dutch until 1654; the occupation was resisted and the Dutch conquest was only successful, it was repelled by the Spaniards. In the interim, thousands of the enslaved Africans had fled to Palmares, soon the mocambos there had grown into two significant states; the Dutch Republic, who allowed sugar production to remain in Portuguese hands, regarded suppression of Palmares impor
The Americas comprise the totality of the continents of North and South America. Together, they comprise the New World. Along with their associated islands, they cover 8% of Earth's total surface area and 28.4% of its land area. The topography is dominated by the American Cordillera, a long chain of mountains that runs the length of the west coast; the flatter eastern side of the Americas is dominated by large river basins, such as the Amazon, St. Lawrence River / Great Lakes basin, La Plata. Since the Americas extend 14,000 km from north to south, the climate and ecology vary from the arctic tundra of Northern Canada and Alaska, to the tropical rain forests in Central America and South America. Humans first settled the Americas from Asia between 17,000 years ago. A second migration of Na-Dene speakers followed from Asia; the subsequent migration of the Inuit into the neoarctic around 3500 BCE completed what is regarded as the settlement by the indigenous peoples of the Americas. The first known European settlement in the Americas was by the Norse explorer Leif Erikson.
However, the colonization never became permanent and was abandoned. The Spanish voyages of Christopher Columbus from 1492 to 1502 resulted in permanent contact with European powers, which led to the Columbian exchange and inaugurated a period of exploration and colonization whose effects and consequences persist to the present. Diseases introduced from Europe and West Africa devastated the indigenous peoples, the European powers colonized the Americas. Mass emigration from Europe, including large numbers of indentured servants, importation of African slaves replaced the indigenous peoples. Decolonization of the Americas began with the American Revolution in the 1770s and ended with the Spanish–American War in the late 1890s. All of the population of the Americas resides in independent countries; the Americas are home to over a billion inhabitants, two-thirds of which reside in the United States, Brazil, or Mexico. It is home to eight megacities: New York City, Mexico City, São Paulo, Los Angeles, Buenos Aires, Rio de Janeiro, Bogotá, Lima.
The name America was first recorded in 1507. Christie's auction house says a two-dimensional globe created by Martin Waldseemüller was the earliest recorded use of the term; the name was used in the Cosmographiae Introductio written by Matthias Ringmann, in reference to South America. It was applied to both North and South America by Gerardus Mercator in 1538. America derives from the Latin version of Italian explorer Amerigo Vespucci's first name; the feminine form America accorded with the feminine names of Asia and Europa. In modern English and South America are considered separate continents, taken together are called America or the Americas in the plural; when conceived as a unitary continent, the form is the continent of America in the singular. However, without a clarifying context, singular America in English refers to the United States of America. In the English-speaking world, the term America used to refer to a single continent until the 1950s: According to historians Kären Wigen and Martin W. Lewis, While it might seem surprising to find North and South America still joined into a single continent in a book published in the United States in 1937, such a notion remained common until World War II.
By the 1950s, however all American geographers had come to insist that the visually distinct landmasses of North and South America deserved separate designations. This shift did not seem to happen in Romance-speaking countries, where America is still considered a continent encompassing the North America and South America subcontinents, as well as Central America; the first inhabitants migrated into the Americas from Asia. Habitation sites are known in Alaska and the Yukon from at least 20,000 years ago, with suggested ages of up to 40,000 years. Beyond that, the specifics of the Paleo-Indian migration to and throughout the Americas, including the dates and routes traveled, are subject to ongoing research and discussion. Widespread habitation of the Americas occurred during the late glacial maximum, from 16,000 to 13,000 years ago; the traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000–17,000 years ago, when sea levels were lowered during the Quaternary glaciation.
These people are believed to have followed herds of now-extinct pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific coast to South America. Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age. Both routes may have
A blockade is an effort to cut off supplies, war material or communications from a particular area by force, either in part or totally. A blockade should not be confused with an embargo or sanctions, it is distinct from a siege in that a blockade is directed at an entire country or region, rather than a fortress or city. While most blockades took place at sea, blockade is still used on land to prevent someone coming into a certain area. A blockading power can seek to cut off all maritime transport to the blockaded country. Blockades restrict the trading rights of neutrals, who must submit for inspection for contraband, which the blockading power may define narrowly or broadly, sometimes including food and medicine. In the 20th century air power has been used to enhance the effectiveness of the blockade by halting air traffic within the blockaded airspace. Close patrol of hostile ports, in order to prevent naval forces from putting to sea, is referred to as a blockade; when coastal cities or fortresses were besieged from the landward side, the besiegers would blockade the seaward side as well.
Most blockades have sometimes included cutting off electronic communications by jamming radio signals and severing undersea cables. Although primitive naval blockades had been in use for millennia, the first successful attempts at establishing a full naval blockade were made by Admiral of the Fleet Edward Hawke during the Seven Years' War. Following the British naval victory at Quiberon Bay, which ended any immediate threat of a major invasion of the British Isles, the British implemented a tight economic blockade on the French coast; this began further weakening France's economy. Hawke took command of the blockading fleet off Brest and extended the blockade of the French coast from Dunkirk to Marseilles; the British were able to take advantage of the Navy's position to develop plans for amphibious landings on the coast. However, these plans were abandoned, due to the formidable logistical challenge this would have posed; the strategic importance of the blockade was cemented during the Revolutionary and Napoleonic Wars, during which successful blockades on France were imposed by the Royal Navy, leading to major economic disruptions.
The Union blockade of southern ports was a major factor in the American Civil War, as was the failure of the U-boat blockade in World War I and again in World War II. Julian Corbett and Admiral Mahan emphasized that naval operations were chiefly to be won by decisive battles and blockade. A close blockade entails placing warships within sight of the blockaded coast or port, to ensure the immediate interception of any ship entering or leaving, it is both the most difficult form of blockade to implement. Difficulties arise because the blockading ships must remain continuously at sea, exposed to storms and hardship far from any support, vulnerable to sudden attack from the blockaded side, whose ships may stay safe in harbor until they choose to come out. In a distant blockade, the blockaders stay well away from the blockaded coast and try to intercept any ships going in or out; this may require more ships on station, but they can operate closer to their bases, are at much less risk from enemy raids.
This was impossible prior to the 16th century due to the nature of the ships used. A loose blockade is a close blockade where the blockading ships are withdrawn out of sight from the coast but no farther; the object of loose blockade is to lure the enemy into venturing out but to stay close enough to strike. British admiral Horatio Nelson applied a loose blockade at Cádiz in 1805; the Franco-Spanish fleet under Pierre-Charles Villeneuve came out, resulting in the Battle of Trafalgar. Until 1827, blockades, as part of economic warfare, were always a part of a war; this changed when France and Britain came to the aid of the Greek rebels against Turkey. They blockaded the Turkish-occupied coast. War was never declared, however; the first pacific blockade, involving no shooting at all, was the British blockade of the Republic of New Granada in 1837, established to compel New Granada to release an imprisoned British consul. Since 1945, the UN Security Council determines the legal status of blockades and by article 42 of the UN Charter, the Council can apply blockades.
The UN Charter allows for the right of self-defense but requires that this must be reported to the Security Council to ensure the maintenance of international peace. According to the not ratified document San Remo Manual on International Law Applicable to Armed Conflicts at Sea, 12 June 1994, a blockade is a legal method of warfare at sea but is governed by rules; the manual describes. The blockading nation is free to select anything else as contraband in a list, which it must publish; the blockading nation establishes a blockaded area of water, but any ship can be inspected as soon as it is established that it is attempting to break the blockade. This inspection can occur inside the blockaded area or in international waters, but never inside the territorial waters of a neutral nation. A neutral ship must obey a request to stop for inspection from the blockading nation. If the situation so demands, the blockading nation can request that the ship divert to a known place or harbour for inspection.
If the ship does not stop the ship is subject to capture. If people aboard the ship resist capture, they can be lawfully attacked
Pedro I of Brazil
Dom Pedro I, nicknamed "the Liberator", was the founder and first ruler of the Empire of Brazil. As King Dom Pedro IV, he reigned over Portugal, where he became known as "the Liberator" as well as "the Soldier King". Born in Lisbon, Pedro I was the fourth child of King Dom João VI of Portugal and Queen Carlota Joaquina, thus a member of the House of Braganza; when their country was invaded by French troops in 1807, he and his family fled to Portugal's largest and wealthiest colony, Brazil. The outbreak of the Liberal Revolution of 1820 in Lisbon compelled Pedro I's father to return to Portugal in April 1821, leaving him to rule Brazil as regent, he had to deal with threats from revolutionaries and insubordination by Portuguese troops, all of which he subdued. The Portuguese government's threat to revoke the political autonomy that Brazil had enjoyed since 1808 was met with widespread discontent in Brazil. Pedro I chose the Brazilian side and declared Brazil's independence from Portugal on 7 September 1822.
On 12 October, he was acclaimed Brazilian emperor and by March 1824 had defeated all armies loyal to Portugal. A few months Pedro I crushed the short-lived Confederation of the Equator, a failed secession attempt by provincial rebels in Brazil's northeast. A secessionist rebellion in the southern province of Cisplatina in early 1825, the subsequent attempt by the United Provinces of the Río de la Plata to annex it, led the Empire into the Cisplatine War. In March 1826, Pedro I became king of Portugal before abdicating in favor of his eldest daughter, Dona Maria II; the situation worsened in 1828. During the same year in Lisbon, Maria II's throne was usurped by Prince Dom Miguel, Pedro I's younger brother; the Emperor's concurrent and scandalous sexual affair with a female courtier tarnished his reputation. Other difficulties arose in the Brazilian parliament, where a struggle over whether the government would be chosen by the monarch or by the legislature dominated political debates from 1826 to 1831.
Unable to deal with problems in both Brazil and Portugal on 7 April 1831 Pedro I abdicated in favor of his son Dom Pedro II, sailed for Europe. Pedro I invaded Portugal at the head of an army in July 1832. Faced at first with what seemed a national civil war, he soon became involved in a wider conflict that enveloped the Iberian Peninsula in a struggle between proponents of liberalism and those seeking a return to absolutism. Pedro I died of tuberculosis on 24 September 1834, just a few months after he and the liberals had emerged victorious, he was hailed by both contemporaries and posterity as a key figure who helped spread the liberal ideals that allowed Brazil and Portugal to move from Absolutist regimes to representative forms of government. Pedro was born at 08:00 on 12 October 1798 in the Queluz Royal Palace near Portugal, he was named after St. Peter of Alcantara, his full name was Pedro de Alcântara Francisco António João Carlos Xavier de Paula Miguel Rafael Joaquim José Gonzaga Pascoal Cipriano Serafim.
He was referred to using the honorific "Dom" from birth. Through his father, Prince Dom João, Pedro was a member of the House of Braganza and a grandson of King Dom Pedro III and Queen Dona Maria I of Portugal, who were uncle and niece as well as husband and wife, his mother, Doña Carlota Joaquina, was the daughter of King Don Carlos IV of Spain. Pedro's parents had an unhappy marriage. Carlota Joaquina was an ambitious woman, who always sought to advance Spain's interests to the detriment of Portugal's. Reputedly unfaithful to her husband, she went as far as to plot his overthrow in league with dissatisfied Portuguese nobles; as the second eldest son, Pedro became his father's heir apparent and Prince of Beira upon the death of his elder brother Francisco António in 1801. Prince Dom João had been acting as regent on behalf of his mother, Queen Maria I, after she was declared incurably insane in 1792. By 1802, Pedro's parents were estranged. Pedro and his siblings resided in the Queluz Palace with their grandmother Maria I, far from their parents, whom they saw only during state occasions at Queluz.
In late November 1807, when Pedro was nine, the royal family escaped from Portugal as an invading French army sent by Napoleon approached Lisbon. Pedro and his family arrived in Rio de Janeiro, capital of Brazil Portugal's largest and wealthiest colony, in March 1808. During the voyage, Pedro read Virgil's Aeneid and conversed with the ship's crew, picking up navigational skills. In Brazil, after a brief stay in the City Palace, Pedro settled with his younger brother Miguel and their father in the Palace of São Cristóvão. Although never on intimate terms with his father, Pedro loved him and resented the constant humiliation his father suffered at the hands of Carlota Joaquina due to her extramarital affairs; as an adult, Pedro would call his mother, for whom he held only feelings of contempt, a "bitch". The early experiences of betrayal and neglect had a great impact on the formation of Pedro's character. A modicum of stability during his childhood was provided by his aia, Maria Genoveva do Rêgo e Matos, whom he loved as a mother, by his aio friar António de Arrábida, who became his mentor.
Both attempted to furnish him with a suitable education. His instruction encompassed a broad array of subjects that included mathematics, political economy, logic and geography, he learned to speak and write not only in Por