Como influyo la primera y segunda guerra mundial al aumento y disminucion de la

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Hi there!
I actually wouldn't say D. Especially before the 1920's the Ku Klux Klan were doing these things to many African Americans, and, although they were based more in the South, it wouldn't be accurate to say that it ALL happened there.
I'd go for C, because, WHAT African American leaders? Until the 1920's, and the start of the jazz craze, black people were unable to get higher jobs- even way after the 1920's it was extremely rare.
Hope this helped ;)