It depends the time, pre WW1, white men. After WW1, woman and black people because all the white men were drafted in the war
Answer:
B. tensions between colonists and Native Americans
Explanation:
I would have to say that the reason to not move to the US would be to send money home because you can do that also without having to immigrate to the US. That is my answer.
200,00 im pretty sure because the population was no where near 1 million at the time.