NEED HELP ASAP What had to happen in the US for slavery to be abolished?

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 a northern objection to the kansas-nebraska act?

Drag each label to the correct location. identify the causes and effects of the great depression.