George mcclellan is considered one of america's greatest military leaders true or false

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.

He table below shows the number of immigrants to the united states from different regions of europe between 1871 and 1910

Compare the roles of the three countries of the central powers.