Which of the following is a way the ice age affected migration of the native peoples on the north american continent

It was the fact that the Ice Age caused the Bering Land Bridge to form between Siberia and North America that affected migration of the native peoples on the North American continent, since this land bridge allowed them to cross over into North America.

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.