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This theory explains how prehistoric people migrated to the Western Hemisphere over a land bridge from Siberia to Alaska.
Lynn Margulis was the American biologist who provided evidence for this theory.
Wegner proved his theory because the fauna and flora found across all continents was similar,the jigsaw fit of Africa and America
Land bridge theory it was believed that land bridges could explain the occurrence of species in separate continents and the resemblances of geologic formations on different continents. Many land bridges were criss-crossing large areas of ocean. However, when the sea bed of the Atlantic Ocean was mapped using echo sounding between 1924 and 1927, no remains of land bridges could be found. Though this was a strong argument for Alfred Wegener's theory of continental drift, it would take about 50 more years until mainstream geology fully acknowledged the motion of continents.
That would be an exciting discovery to say the least. The theory could be maintained with the condition: Regarding all life native to planet earth... The alien would probably be a really strange creature.
They crossed over the land bridge called Beringia
The most popular theory would be that they traveled across the Barring Straight Land Bridge.
No one knows how the Native Americans got to America, but there is a theory called the "land-bridge theory" that offers an explanation that many agree with. The northern American aboriginals walked across from Siberia to Alaska thousands of years ago when the ice age froze up huge amounts of water in the Bering Strait.
Some will tell you that they have always been here. My belief is the land bridge from Siberia. Ocean crossings has become a popular theory as of late but doesn't offer a large population change. We do know Native American's go back to the ice age.
Yes, this is a theory which is believed by many people in the modern world today, it is believed that people from Russia and Siberia crossed the Baring Strait when it was frozen over 20 000 - 40000 years ago and spread out across North America, and when settlers came they became know as Native Americans. However Native American's refute this theory and state they have lived on the land since the beginning of time itself.
evolution theory
The truth is we don't know. The common theory has been by walking across the Bering Land bridge, but equal evidence supports by sea from Europe, Asia, and Oceans by hundreds to tens of thousands of years earlier.
According to the currently most accepted theory, the first people to occupy the Americas came across a huge ice bridge that connected northeastern Asia with what is now Alaska toward the end of the last Ice Age.
It is believed that there was a land bridge between the area of present day Russia and Alaska. People walked across for a still unknown reason, it is thought they were chasing food sources. They then spread out all over the North and South American continent and formed the Native American Tribes.
Almost all of the theory behind the American system of government was developed long before George Washington discussed it with Native Americans. The main Native American contribution was to show that such a government actually worked in practice for a secular government and not just for a religious one.
Modern science supports the theory that humans in North and South America migrated from Asia across a land bridge that connected Alaska and Siberia. Because of a more simple culture among Native Americans, advanced ship building was never necessary, and therefore travel across the oceans was not possible.
There is a theory that the word Wisconsin is an Algonquian word for a gathering of waters.