Breeding Hate
Ethnic purity originally came from Hitler’s personal diary, Mein Kampf.
Here he detailed what he called the “Untermensch” (subhumans) as Jews, Roma, ethnic Poles and certain Slavic people. None of these groups of people were righteous enough to be Aryans.
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School Education
In schools, children learned how to differentiate between Aryans and “Untermenschen” based on biased racial stereotypes.
Schools taught that anyone who was not an Aryan was supposed to be exterminated or sent into slavery.