Identify In which river valley did China's civilization to being?

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.

Analyze interactions among people and events what political sentiment did president harding’s election reveal? explain

Which is an effective question for launching history inquiry related to the cold war