where are the native americans ancestors from?

Question

please help i don't know the answer

Answer 1

Which native Americans?

Some are thought to have come across the Bering Land Bridge. Is that what you mean?
http://archaeology.about.com/od/bcthroughbl/qt/beringia.htm

Answer 2

The Native American's ancestors came from northeastern Asia. They crossed the land bridge over what is now the Bering Strait. Some probably also came by boat along the northeastern Asian coast and down the northwestern American coast.

http://education-portal.com/cimages/multimages/16/migration.gif