World war ii began with the german invasion of

to answer your question Poland and Germany are the answers.

they were treated very badly. they were targeted by white supremacists and other groups, like the klu klux klan, even after coming back to the country as veterans. they were seen as inferior and gave the african americans new found motivation to fight against this racial injustice. 

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes