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.
Answer:
"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.
