Learn about Prehistoric people of America 40 000 - 10 000 B.C. in this educational video from dizzo95.
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The ancestors of Native North American came from Asia. During the last ice age, sea levels dropped allowing a land bridge to emerge what is now the Bering Straight and connect to Asia with North America.
Archeologist believe that the first migrations began 40,000 years ago when generations of nomads move southward and eastward across what is now Canada and the United States and eventually ascent to Central America. These migrations happen in wave over thousands of years. As the land bridge opened and closed.
According to the ebb and flow of the glaciers, by 15,000 BC these migratory groups have spread throughout North America. Establishing their own pattern of life that archeologist would discover later to the artifacts and bones they left behind. Many of this society were hunters and gatherers who preyed on the giant bison and great mammoth that roamed the plains. Stoned tip projectiles have been found at clover symposium in modern New Mexico.
As the number of big game animals decline, some of these groups began to rely on plants, fish and small gain for food. Their tools became more sophisticated as his contact between groups. Scythe like Pennsylvania, show evidence of trade. The climate change and as it warms the glaciers melt and retreated for the last time. The sea level rose and submerges the land bridge cutting off the passage from Asia and separating North America.
By that time generations of native North Americans have long since begun to develop the distinctive cultures and tribe the European would encounter centuries later.