Question

He may have proved that ancient people could have come to North America from ____

Answer 1

Answer:

Russia.

Explanation:

All the other answers make no sense.

About 10-50 thousand years ago, there was a landbridge that connected Russia(Asia) and North America(Alaska, Canada, etc).

Many decided to travel across this land bridge in search on new lands and resources. They also wanted to escape barbarians and harsh rulers/landlords.  

Around 10,000 BCE, the bridge started to rock and collapse, and that was the end, at least until the 1700s and 1800s AD.