What are the different ways the federal government distributes money to the states and local government?

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 from the columbian exchange had perhaps the biggest impact on the world?

What religion influenced the first persian empire as established by cuyrus the great?