Well, because most white men were away fighting, and jobs needed to be filled, black people and women found jobs. This was a great leap in the civil rights movement, because now white people were forced to accept black people. It was bad for Japanese americans because they were forced into a racism of their own. Americans assumed that all Japanese were bad, and took them of their jobs.
I didn't use the key terms, but I hope this is a good start! (:
