What was the religion of river vally civilizations

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.

How did the governor's order that only georgian officers could command georgia's troops demonstrate a problem in the south

What is the main reason the united states removed the taliban from power shortly after the september 11 2001 attacks ?