Two Worlds Meet ? How did the first Americans arrive in America? It is believed that during the last Ice Age between 13,000 and 3,000 B.C. migrants from Asia had crossed 100-mile-wide land connecting Siberia and Alaska becoming the first Americans. About eight thousand years ago travelling by water were the ancestors of the Navajos and the Apaches who arrived at North America as well and after them the third wave of migrants were the Aleut and Inuit people. Then they all dispersed throughout America. ? What were the spiritual beliefs of Native Americans? The Native americans were called animist and they believed the natural world was suffused with spiritual power. The males would perform rituals before and after a hunt in a way to not