When did the Native Americans arrive in America?

Nobody knows exactly when, but it was thousands of years ago (nearly 25000 years BC). Historians believe they migrated over a land bridge on what is now the Bering Straight between present day Alaska and Russia. They broke into groups and eventually migrated even further south into Mexico, Mesoamerica, and South America. They all lived differently depending on where they lived. For example, the Inuit, or Eskimos, of Canada and Alaska, versus the Pueblo Indians of the Southwest United States. Hope this helps!