Adolf Hitler consistently blamed Germany's internal and external problems on the Jewish peoples. Hitler believed that the Jews were longstanding foes of Germany and focusing on ridding/killing off Eastern Europe of Jews and Slavics would give Germans "living space" or area for German prosperity.
These ideals led to the Holocaust (a mass killing of of about 17 million people) including about six million Jews, Romani, Slavics, Soviet Prisoners of War, political opponents, and Jehovah's Witnesses by Nazi Germany and its collaborators.
Originally the United States only had atomic weapons, but that all changed when in 1949 the U.S.S.R (or the Soviet Union) set off an atomic bomb, which started the Nuclear Arms race.
Hope this helps, have a BLESSED day! :-)
D. reconstruction affected backs by reversing their access to education and political equality, and restricting access to economic belief.