What is an Australian ballot?

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.

Which one of the following statements best characterizes change to agriculture in the united states since 1900

Thomas jefferson was the president of the united states. first second third fourth