Which neighboring nation was most concerned about the united nations

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 new working class of the industrial revolution differ from the working classes of the earlier, farm based economy?

Identify they difference in plant domestication between mesopotamia and mesoamerica during the neolithic revolution