Why did early peoples migrate from Asia to American?

A) The earliest known migration of peoples from Asia to America occurred during the last glacial period, between 15,000 and 13,000 years ago. During this time, the sea levels were much lower, exposing a land bridge between Siberia and Alaska known as the Bering Land Bridge. People and animals were able to cross this land bridge from Asia to North America.

B) As the climate began to warm and the glaciers melted, the sea levels rose, submerging the Bering Land Bridge. This cut off the migration route from Asia to North America, and the people who had already crossed were isolated in the Americas.

C) Over time, these early migrants spread throughout North and South America, giving rise to the various Native American cultures that exist today.