Holocaust was the primary reason the United nations called for a convention on prevention and punishment of Genocide in 1948.
In the Anschluss, Hitler took over Austria because he believed "<span>that all German people should be united," since Hitler felt that this land and people were historically of German origin. </span>
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Without the support of federal troops, segregation in the South lasted from the time of Reconstruction until 1964 and Civil rights Act, there was racial segregation in many counties in southern states till that year.
The reason that federal courts do not try these cases is because there are already special courts just for these types of cases.