What is the name of the mass movement of african americans from the rural south to the urban areas in the midwest and northeast?

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

What was the significance of the battle of saratoga

How has the caste system canged in indea and pacistane