Why did people migrate from Asia to the Americas

"Climate conditions" and "Fertile land" are the two major factors behind people's migration from Asia to America.

Explanation:

The people migrate from one place to another where they found suitable condition or factors which support them to survive, reproduce and flourished.

These factors are:

Favorable climate condition

Availability of adequate drinking water

Food

Fertile land

shelter, etc.

Conditions in Asia were becoming poor and emigres were searching for better locations to live in, possibly meaning the weather had become awful and therefore made their homelands intolerable.