1.) Nativism is quite similar to nationalism, only it's more toward "protecting" the interests of native-born citizens against the interests of immigrants. The reason why some Americans disliked immigrants at the time was because they feared they were going to secretly plan an attack on the mainland, and claimed they were communists in disguise. In reality though, many immigrants just wanted a better life and sought for that in America.
2.) Some push factors would be poverty, war, religious persecution, and lack of jobs & opportunities. Some pull factors would be freedom and new jobs & opportunities for immigrants.
3.) N/A: Not sure what the answer is to this one :(
4.) Asian immigrants faced much more discrimination than the European immigrants. They were seen as inferior, as well as black and Hispanic immigrants.
5.) In the early 20th century, East Europeans sought for a better life in America -- but many were rejected and discriminated against, with the U.S. government favoring Europeans from Ireland, England, etc. The fear of communism at the time led to discrimination and hatred toward East Europeans (the "Red Scare").
