How did the victory at Vicksburg help the Union Army?

Which events are correlated but do not necessarily have a causal relationship?

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.

Pl ! the term laissez-faire refers to the government’s approach, in the 1890s, to foreign policy affecting trade. economic policy affecting business. educational policy affecting schools. domestic policy affecting social reform.