Pirate raiding of American merchant ships lead to these wars?

Which of these belongs to the united states after the spanish american war ?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

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.