What does the National Security Act foreshadow about the Cold War?

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.

Were african-americans allowed to serve in the military in wwi?

What did the introduction of silk into the mediterranean do for the abbasid empire