Who was responsible for the first-known combat between gladiators in rome, and why did the custom grow?

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?

Why must governments be able to compromise?