Main cause communism. The north did not want to adopt communism while the south did hence the reason for why the US got involved to make sure that the north would win so as to help stop the spread of communism (sorry i know this is kind of late)
Answer: Hoboes- was the name of person who were homeless and traveled along rail lines hopping on trains.
The one effect of plate movement on pacific region was an earthquake
Through appeasement, but eventually they would change their policy and make the right choice :)