Socialism: Socialism was getting exposure at this time. Writers such as Louis Blanc, Proudon and Marx were all publishing their writings.
Trump has emphasized U.S. border security and illegal immigration to the United States as a campaign issue. During his announcement speech he stated in part, "When Mexico sends its people, they're not sending their best. They're not sending you.
Well, in the first World War, Germany lost the war because of the Jewish. Another reason would be that Hitler used myths and lies, and used anti-semitism to his advantage, with myths like how the Jews killed Jesus Christ(when it was actually the Romans) So because of religious prejudice and a long history of anti-semitism made them prime targets.
They were constantly experiencing racism, discrimination, and segregation. As well as being forced into marches , riots , or parades just to actually be heard in the white society.