What is the most widely accepted theory on how early humans migrated to north america

There used to be a land bridge between Russia and Alaska 

This theory was first proposed in 1590 by José de Acosta and has been widely accepted since the 1930s. The Land Bridge Theory proposes that people migrated from Siberia to Alaska across a land bridge that spanned the current day Bering Strait.

Amuslim warrior especially : one victorious in battle against the opponents of islam —often used as a title of honor.