How did americans opinions on overseas expansion begin to change in the 1800s

Why does reagan claim the united states needs a strong defense policy?

Which fact would this be, and how might you verify the truth?

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.