1.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located 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, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
2.
Mississippian culture
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The Mississippian culture was a mound-building Native American civilization archeologists date from approximately 800 CE to 1600 CE, varying regionally. It was composed of a series of settlements and satellite villages linked together by a loose trading network. The Mississippian way of life began to develop in the Mississippi River Valley, cultures in the tributary Tennessee River Valley may have also begun to develop Mississippian characteristics at this point. Almost all dated Mississippian sites predate 1539–1540, with exceptions being Natchez communities that maintained Mississippian cultural practices into the 18th century. A number of traits are recognized as being characteristic of the Mississippians. Although not all Mississippian peoples practiced all of the following activities, the construction of large, truncated earthwork pyramid mounds, or platform mounds. Such mounds were usually square, rectangular, or occasionally circular, structures were usually constructed atop such mounds. The adoption and use of shells as tempering agents in their shell tempered pottery. Widespread trade networks extending as far west as the Rockies, north to the Great Lakes, south to the Gulf of Mexico, the development of the chiefdom or complex chiefdom level of social complexity. The development of institutionalized social inequality, a centralization of control of combined political and religious power in the hands of few or one. The beginnings of a settlement hierarchy, in one major center has clear influence or control over a number of lesser communities. The adoption of the paraphernalia of the Southeastern Ceremonial Complex, also called the Southern Cult and this is the belief system of the Mississippians as we know it. SECC items are found in Mississippian-culture sites from Wisconsin to the Gulf Coast, the SECC was frequently tied in to ritual game-playing, as with chunkey. The Mississippians had no writing system or stone architecture, the Mississippi stage is usually divided into three or more chronological periods. Each period is an historical distinction varying regionally. At a particular site, each period may be considered to begin earlier or later, the Mississippi period should not be confused with the Mississippian culture. The Mississippi period is the stage, while Mississippian culture refers to the cultural similarities that characterize this society. The Early Mississippi period had just transitioned from the Late Woodland period way of life, different groups abandoned tribal lifeways for increasing complexity, sedentism, centralization, and agriculture
3.
Pre-Columbian era
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For this reason the alternative terms of Precontact Americas, Pre-Colonial Americas or Prehistoric Americas are also in use. In areas of Latin America the term used is Pre-Hispanic. Other civilizations were contemporary with the period and were described in European historical accounts of the time. A few, such as the Maya civilization, had their own written records, because many Christian Europeans of the time viewed such texts as heretical, men like Diego de Landa destroyed many texts in pyres, even while seeking to preserve native histories. Only a few documents have survived in their original languages, while others were transcribed or dictated into Spanish, giving modern historians glimpses of ancient culture. Indigenous American cultures continue to evolve after the pre-Columbian era, many of these peoples and their descendants continue traditional practices, while evolving and adapting new cultural practices and technologies into their lives. Now, the study of pre-Columbian cultures is most often based on scientific. Asian nomads are thought to have entered the Americas via the Bering Land Bridge, now the Bering Strait, genetic evidence found in Amerindians maternally inherited mitochondrial DNA supports the theory of multiple genetic populations migrating from Asia. Over the course of millennia, Paleo-Indians spread throughout North and South America, exactly when the first group of people migrated into the Americas is the subject of much debate. One of the earliest identifiable cultures was the Clovis culture, with sites dating from some 13,000 years ago, however, older sites dating back to 20,000 years ago have been claimed. Some genetic studies estimate the colonization of the Americas dates from between 40,000 and 13,000 years ago, the chronology of migration models is currently divided into two general approaches. The first is the short chronology theory with the first movement beyond Alaska into the New World occurring no earlier than 14, 000–17,000 years ago, followed by successive waves of immigrants. The second belief is the long chronology theory, which proposes that the first group of people entered the hemisphere at an earlier date, possibly 50. In that case, the Eskimo peoples would have arrived separately and at a later date, probably no more than 2,000 years ago. The North American climate was unstable as the ice age receded and it finally stabilized by about 10,000 years ago, climatic conditions were then very similar to todays. Within this timeframe, roughly pertaining to the Archaic Period, numerous archaeological cultures have been identified, the unstable climate led to widespread migration, with early Paleo-Indians soon spreading throughout the Americas, diversifying into many hundreds of culturally distinct tribes. The paleo-indians were hunter-gatherers, likely characterized by small, mobile bands consisting of approximately 20 to 50 members of an extended family and these groups moved from place to place as preferred resources were depleted and new supplies were sought. During much of the Paleo-Indian period, bands are thought to have subsisted primarily through hunting now-extinct giant land animals such as mastodon, Paleo-Indian groups carried a variety of tools
4.
Earthworks (archaeology)
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In archaeology, earthworks are artificial changes in land level, typically made from piles of artificially placed or sculpted rocks and soil. Earthworks are often known as barrows in England, and mounds in North America, Earthworks can themselves be archaeological features, or they can show features beneath the surface. They are believed to have used as monuments for spiritual ritual ceremonies. Long barrows are oblong-shaped mounds that are used for burials, tumuli are mounds of earth created over a tomb, it has the same meaning as barrow. A cross dyke or cross-ridge dyke is a bank and ditch, found in Europe and often belonging to the later Bronze Age or Iron Age. Often marked on Ordnance Survey maps in the UK. Ridge and furrows are sets of parallel depressions, mottes are mound structures made of earth and stone that once held castles. A round barrow is a mound that is in a shape that was used during Neolithic times as a burial mound. Geoglyph, a design or motif Earthworks can vary in height from a few centimetres to the size of Silbury Hill at 40 metres. They can date from the Neolithic to the present, the structures can also stretch for many tens of kilometres. In area, they can cover many hectares, for example, Maiden Castle, shallow earthworks are often more visible as cropmarks or in aerial photographs if taken when the sun is low in the sky and shadows are more pronounced. Similarly, earthworks may be visible after a frost or a light dusting of snow. Earthworks can be detected and plotted using Light Detection and Ranging and this technique is particularly useful for mapping small variations in land height that would be difficult to detect by eye. It can be used to map features beneath forest canopy and for features hidden by other vegetation, LIDAR results can be input into a geographic information system to produce three-dimensional representations of the earthworks. An accurate survey of the earthworks can enable them to be interpreted without the need for excavation, for example, earthworks from deserted medieval villages can be used to determine the location, size, and layout of lost settlements. Often these earthworks can point to the purpose of such a settlement, Earthworks in North America include mounds built by Native Americans known as the Mound Builders. Ancient people who lived in the American Midwest commonly built effigy mounds, possibly the most famous of these effigy mounds is Serpent Mound. Located in the Ohio, this 411-meterlong earthen work is thought to memorialize alignments of the planets, cone-shaped or conical mounds are also numerous, with thousands of them scattered across the American Midwest, some over 80 feet tall. These conical mounds appear to be marking the graves of one person or even dozens of people
5.
Great Pyramid of Giza
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The Great Pyramid of Giza is the oldest and largest of the three pyramids in the Giza pyramid complex bordering what is now El Giza, Egypt. It is the oldest of the Seven Wonders of the Ancient World, initially at 146.5 metres, the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years. Originally, the Great Pyramid was covered by casing stones that formed an outer surface. Some of the stones that once covered the structure can still be seen around the base. There have been varying scientific and alternative theories about the Great Pyramids construction techniques, most accepted construction hypotheses are based on the idea that it was built by moving huge stones from a quarry and dragging and lifting them into place. There are three chambers inside the Great Pyramid. The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished, the so-called Queens Chamber and Kings Chamber are higher up within the pyramid structure. It is believed the pyramid was built as a tomb for Fourth Dynasty Egyptian pharaoh Khufu and was constructed over a 20-year period, Khufus vizier, Hemiunu, is believed by some to be the architect of the Great Pyramid. It is thought that, at construction, the Great Pyramid was originally 280 Egyptian cubits tall, each base side was 440 cubits,230.4 metres long. The mass of the pyramid is estimated at 5.9 million tonnes, the volume, including an internal hillock, is roughly 2,500,000 cubic metres. Based on these estimates, building the pyramid in 20 years would involve installing approximately 800 tonnes of stone every day, the first precision measurements of the pyramid were made by Egyptologist Sir Flinders Petrie in 1880–82 and published as The Pyramids and Temples of Gizeh. Almost all reports are based on his measurements, many of the casing stones and inner chamber blocks of the Great Pyramid fit together with extremely high precision. Based on measurements taken on the casing stones, the mean opening of the joints is only 0.5 millimetre wide. The pyramid remained the tallest man-made structure in the world for over 3,800 years, the accuracy of the pyramids workmanship is such that the four sides of the base have an average error of only 58 millimetres in length. The base is horizontal and flat to within ±15 mm, the ratio of the perimeter to height of 1760/280 royal cubits equates to 2π to an accuracy of better than 0. 05%. Some Egyptologists consider this to have been the result of deliberate design proportion, verner wrote, We can conclude that although the ancient Egyptians could not precisely define the value of π, in practice they used it. Petrie, author of Pyramids and Temples of Gizeh concluded, but these relations of areas, others have argued that the Ancient Egyptians had no concept of pi and would not have thought to encode it in their monuments. They believe that the observed pyramid slope may be based on a simple seked slope choice alone, with no regard to the overall size, in 2013 rolls of papyrus were discovered written by some of those who delivered stone and other construction materials to Khufus brother at Giza
6.
Pyramid of the Sun
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The Pyramid of the Sun is the largest building in Teotihuacan, believed to have been constructed about 200 CE, and one of the largest in Mesoamerica. The name Pyramid of the Sun comes from the Aztecs, who visited the city of Teotihuacan centuries after it was abandoned and it was constructed in two phases. The first construction stage, around 100 CE, brought the pyramid to nearly the size it is today, the second phase also saw the construction of an altar atop of the pyramid, which has not survived into modern times. Over the structure the ancient Teotihuacanos finished their pyramid with lime plaster imported from surrounding areas, while the pyramid has endured for centuries, the paint and plaster have not and are no longer visible. Jaguar heads and paws, stars, and snake rattles are among the few images associated with the pyramids and it is thought that the pyramid venerated a deity within Teotihuacan society, however, little evidence exists to support this hypothesis. The orientation of the structure may hold some anthropological significance, the day of August 12 is significant because it would have marked the date of the beginning of the present era and the initial day of the Maya long-count calendar. In addition, many important astronomical events can be viewed from the location of the pyramid that are important in terms of agriculture and belief systems of the ancient society. The pyramid was built over a tunnel leading to a cave located six metres down beneath the centre of the structure. Originally this was believed to be a naturally formed lava tube cave and interpreted as possibly the place of Chicomoztoc, more recent excavations have suggested that the space is man-made and could have served as a royal tomb. Only a few caches of artifacts have been found in and around the pyramid and these objects may have represented sacrificial victims. A unique historical artifact discovered near the foot of the pyramid at the end of the century was the Teotihuacan Ocelot. In addition, burial sites of children have found in excavations at the corners of the pyramid. It is believed that these burials were part of a sacrificial ritual dedicating the building of the pyramid, List of Mesoamerican pyramids List of tallest ancient structures
7.
Teotihuacan
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Additionally, Teotihuacan exported fine obsidian tools that garnered high prestige and widespread usage throughout Mesoamerica. The city is thought to have been established around 100 BC, the city may have lasted until sometime between the 7th and 8th centuries AD, but its major monuments were sacked and systematically burned around 550 AD. Teotihuacan began as a new center in the Mexican Highlands around the first century AD. This city came to be the largest and most populated center in the pre-Columbian Americas, Teotihuacan was even home to multi-floor apartment compounds built to accommodate this large population. The term Teotihuacan is also used for the civilization and cultural complex associated with the site. The later Aztecs saw these magnificent ruins and claimed a common ancestry with the Teotihuacanos, the ethnicity of the inhabitants of Teotihuacan is also a subject of debate. Possible candidates are the Nahua, Otomi, or Totonac ethnic groups, scholars have also suggested that Teotihuacan was a multi-ethnic state. The city and the site are located in what is now the San Juan Teotihuacán municipality in the State of México. The site covers a surface area of 83 square kilometres and was designated a UNESCO World Heritage Site in 1987. It is the most visited site in Mexico. The name Teōtīhuacān was given by the Nahuatl-speaking Aztecs centuries after the fall of the city around 550 A. D, the term has been glossed as birthplace of the gods, or place where gods were born, reflecting Nahua creation myths that were said to occur in Teotihuacan. Nahuatl scholar Thelma D. Sullivan interprets the name as place of those who have the road of the gods and this is because the Aztecs believed that the gods created the universe at that site. The name is pronounced in Nahuatl, with the accent on the syllable wa, by normal Nahuatl orthographic conventions, a written accent would not appear in that position. Both this pronunciation and Spanish pronunciation, are used, and both appear in this article. The original name of the city is unknown, but it appears in texts from the Maya region as puh. This naming convention led to confusion in the early 20th century. It now seems clear that Tollan may be understood as a generic Nahua term applied to any large settlement, the early history of Teotihuacan is quite mysterious, and the origin of its founders is uncertain. Around 300 BC, people of the central and southeastern area of Mesoamerica began to gather into larger settlements, Teotihuacan was the largest urban center of Mesoamerica before the Aztecs, almost 1000 years prior to their epoch
8.
Egyptian pyramids
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The Egyptian pyramids are ancient pyramid-shaped masonry structures located in Egypt. As of November 2008, sources cite either 118 or 138 as the number of identified Egyptian pyramids, most were built as tombs for the countrys pharaohs and their consorts during the Old and Middle Kingdom periods. The earliest known Egyptian pyramids are found at Saqqara, northwest of Memphis, the earliest among these is the Pyramid of Djoser which was built during the third dynasty. This pyramid and its surrounding complex were designed by the architect Imhotep, the most famous Egyptian pyramids are those found at Giza, on the outskirts of Cairo. Several of the Giza pyramids are counted among the largest structures ever built, the Pyramid of Khufu at Giza is the largest Egyptian pyramid. It is the one of the Seven Wonders of the Ancient World still in existence. By the time of the Early Dynastic Period, those with sufficient means were buried in bench-like structures known as mastabas, the second historically-documented Egyptian pyramid is attributed to the architect Imhotep, who planned what Egyptologists believe to be a tomb for the pharaoh Djoser. Imhotep is credited with being the first to conceive the notion of stacking mastabas on top of each other, the result was the Pyramid of Djoser, which was designed to serve as a gigantic stairway by which the soul of the deceased pharaoh could ascend to the heavens. Such was the importance of Imhoteps achievement that he was deified by later Egyptians, the most prolific pyramid-building phase coincided with the greatest degree of absolutist rule. It was during this time that the most famous pyramids, the Giza pyramid complex, were built. Long after the end of Egypts own pyramid-building period, a burst of pyramid-building occurred in what is present-day Sudan, al-Aziz Uthman tried to destroy the Giza pyramid complex. He gave up after damaging the Pyramid of Menkaure because the task proved too huge, the shape of Egyptian pyramids is thought to represent the primordial mound from which the Egyptians believed the earth was created. Pyramids were often named in ways that referred to solar luminescence. For example, the name of the Bent Pyramid at Dahshur The Southern Shining Pyramid. While it is agreed that pyramids were burial monuments, there is continued disagreement on the particular theological principles that might have given rise to them. One suggestion is that they were designed as a type of resurrection machine, the Egyptians believed the dark area of the night sky around which the stars appear to revolve was the physical gateway into the heavens. One of the shafts that extend from the main burial chamber through the entire body of the Great Pyramid points directly towards the center of this part of the sky. This suggests the pyramid may have designed to serve as a means to magically launch the deceased pharaohs soul directly into the abode of the gods
9.
Clay
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Clay is a fine-grained natural rock or soil material that combines one or more clay minerals with traces of metal oxides and organic matter. Geologic clay deposits are composed of phyllosilicate minerals containing variable amounts of water trapped in the mineral structure. Clays are plastic due to water content and become hard, brittle. Depending on the content in which it is found, clay can appear in various colours from white to dull grey or brown to deep orange-red. Although many naturally occurring deposits include both silts and clay, clays are distinguished from other fine-grained soils by differences in size, silts, which are fine-grained soils that do not include clay minerals, tend to have larger particle sizes than clays. There is, however, some overlap in size and other physical properties. The distinction between silt and clay varies by discipline, geologists and soil scientists usually consider the separation to occur at a particle size of 2 µm, sedimentologists often use 4–5 μm, and colloid chemists use 1 μm. Geotechnical engineers distinguish between silts and clays based on the plasticity properties of the soil, as measured by the soils Atterberg limits, ISO14688 grades clay particles as being smaller than 2 μm and silt particles as being larger. These solvents, usually acidic, migrate through the rock after leaching through upper weathered layers. In addition to the process, some clay minerals are formed through hydrothermal activity. There are two types of deposits, primary and secondary. Primary clays form as residual deposits in soil and remain at the site of formation, secondary clays are clays that have been transported from their original location by water erosion and deposited in a new sedimentary deposit. Clay deposits are associated with very low energy depositional environments such as large lakes. Depending on the source, there are three or four main groups of clays, kaolinite, montmorillonite-smectite, illite, and chlorite. Chlorites are not always considered to be a clay, sometimes being classified as a group within the phyllosilicates. There are approximately 30 different types of clays in these categories. Varve is clay with visible annual layers, which are formed by deposition of those layers and are marked by differences in erosion. This type of deposit is common in glacial lakes
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Missionary
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A missionary is a member of a religious group sent into an area to proselytize and/or perform ministries of service, such as education, literacy, social justice, health care, and economic development. The word mission originates from 1598 when the Jesuits sent members abroad, derived from the Latin missionem, meaning act of sending or mittere, meaning to send. The word was used in light of its usage, in the Latin translation of the Bible. The term is most commonly used for Christian missions, but can be used for any creed or ideology, a Christian missionary can be defined as one who is to witness across cultures. The Lausanne Congress of 1974, defined the term, related to Christian mission as, Missionaries can be found in many countries around the world. Jesus instructed the apostles to make disciples of all nations and this verse is referred to by Christian missionaries as the Great Commission and inspires missionary work. The New Testament-era missionary outreach of the Christian church from the time of St Paul expanded throughout the Roman Empire and beyond to Persia, in 596, Pope Gregory the Great sent the Gregorian Mission into England. In their turn, Christians from Ireland and from Britain became prominent in converting the inhabitants of central Europe, about the same time, missionaries such as Francis Xavier as well as other Jesuits, Augustinians, Franciscans, and Dominicans started moving into Asia and the Far East. The Portuguese sent missions into Africa and these are some of the most well-known missions in history. While some missions accompanied imperialism and oppression, others were relatively peaceful, contemporary Christian missionaries argue that working for justice forms a constitutive part of preaching the Gospel, and observe the principles of inculturation in their missionary work. Over time, the Vatican gradually established a church structure in the mission areas, often starting with special jurisdictions known as apostolic prefectures. The two 9th-century saints Cyril and Methodius had extensive success in central Europe. The Byzantines expanded their work in Ukraine after a mass baptism in Kiev in 988. The Serbian Orthodox Church had its origins in the conversion by Byzantine missionaries of the Serb tribes when they arrived in the Balkans in the 7th century, Orthodox missionaries also worked successfully among the Estonians from the 10th to the 12th centuries, founding the Estonian Orthodox Church. The Russian St. Nicholas of Japan took Eastern Orthodoxy to Japan in the 19th century, the Russian Orthodox Church also sent missionaries to Alaska beginning in the 18th century, including Saint Herman of Alaska, to minister to the Native Americans. Quaker publishers of truth visited Boston and other mid-17th century colonies, the Danish government began the first organized Protestant mission work through its College of Missions, established in 1714. This funded and directed Lutheran missionaries such as Bartholomaeus Ziegenbalg in Tranquebar, India and he also got to know a slave from the Danish colony in the West Indies. Within thirty years, Moravian missionaries had become active on every continent, and they are famous for their selfless work, living as slaves among the slaves and together with the Native Americans, the Delaware and Cherokee Indian tribes
