Who arrived first in America?

It's not really known who arrived first in the Americas. The most common theory is that people of the northern area of modern Russia arrived about 30,000 years ago via the Bering land bridge (Beringia). However, there is evidence of people settled in the Western Hemisphere long before these people could have arrived. Some theories support ocean going people from the northern Japanese islands. Other theories support the arrival of early Polynesians. No matter which theory you support, it is at best a guess with some evidence. The fact is that modern dating techniques prove that the Beringia theory is not perhaps as accurate as once believed.