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Depending on the context, the terms "Indian" or "Native American" may or may not include the Eskimos ( Inuit, Yupik, and Aleut peoples), whose culture and genetics are distinct from the other groups. The terms may be construed either to include or to exclude the Canadian Métis.
See also: Archeology of the Americas
Based on anthropological and genetic evidence, scientists generally agree that most Native Americans descend from people who migrated from SiberiaSiberia ( Russian: , common English transliterations: Sibir Sibir' is a vast region of Russia and northern Kazakhstan, constituting all of northern Asia, and extending eastward from the Ural Mountains to the Pacific Ocean, and southward from the Arctic Oc across the Bering StraitThe Bering Strait is a sea strait between Cape Dezhnev, the eastmost point of the Asian continent and Cape Prince of Wales, the westernmost point of the American continent, about 85 km in width, with a depth of 30 50 m. The strait connects the Chukchi Sea, at least 12,000 years ago.
The exact epoch and route is still a matter of controversy. Until recently there was a consensus that the migrants crossed the strait around 10,000 BCE via the Bering Land Bridge which existed during the last ice ageFor the animated movie, see Ice Age (movie . For the band, see Ice Age (band . An ice age is a period of long-term downturn in the temperature of Earth's climate, resulting in an expansion of the polar ice caps and mountain glaciers (" glaciation"). Glaci ( 24,000 to 9,000 BCE), and that they followed an inland route through Alaska and Canada that had just been freed of its ice cover. There are a number of difficulties in this theory — in particular, growing evidence of human presence in BrazilThis article is about Brazil, the country. For other article subjects named Brazil see Brazil (disambiguation). The Federative Republic of Brazil Republica Federativa do Brasil in Portuguese) is the largest and most populous country in South America. and Chile by 9,500 BCE or earlier [1]. Thus other possibilities, not necessarily exclusive, have been suggested:
Mainstream anthropologists and archaeologists consider the genetic, linguistic, and cultural evidence for a primarily Siberian origin overwhelming. According to this evidence, at least three separate migrations from Siberia to the Americas are highly likely to have occurred:
One result of these successive waves of migration is that large groups of Native Americans with similar languages and perhaps physical characteristics as well, moved into various geographic areas of North, and then Central and South America. While Native Americans have traditionally remained primarily loyal to their individual tribes, ethnologists have variously sought to group the myriad of tribes into larger entities which reflect common geographic origins, linguistic similarities, and life styles. (see Classification of Native Americans)
While many Native American groups retained a nomadic or semi-nomadic lifestyle through the time of European occupation of the New World, in some regions, specifically in the Mississippi River valley of the United States, in Mexico, Central America, the Andes of South America, they built advanced civilizations with monumental architecture and large-scale organization into cities and states.
Other theories have been advanced, with little acceptance, as to the ultimate origin of Native Americans:
See also: Mississippian civilization, Cahokia, Mesoamerica, Maya, Olmec, Zapotec, Toltec, Teotihuacan, Aztec, Aymara, Inca, indigenous people of Brazil.