Why did mexican migration to the u. s. change drastically in the 1930s?

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 do i do this? true or false? : elephants have the same dna as humans and bananas alike.

What does the document of the birtish octopus is an uderlying cause of the world war 1