I thi k its the last one (for native americans to change theor ways so they were more like people ofeuropean descent)
Answer:
Historians describe how white Southerners felt about black civil rights, and explain the intent of white supremacist groups.
Explanation:
There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
I think that it would be A
