They removed existing rulers from the conquered lands to ensure they had direct control of their enemies' trade routes. They forced all the people they conquered to trade directly with them, increasing their wealth from the sale of additional goods. They took all conquered people as prisoners and forced them to work as slaves on public works projects. The tribute demanded from conquered peoples provided warriors for defense, as well as food and resources for their own people.
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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.