Hitler believed that Germans belonged to a "master race" of ___??

purity

Explanation:

Aryan

Explanation:

For years before Adolf Hitler became chancellor of Germany, he was obsessed with ideas about race. In his speeches and writings, Hitler spread his beliefs in racial "purity" and in the superiority of the "Germanic race"—what he called an Aryan "master race." He pronounced that his race must remain pure in order to one day take over the world. For Hitler, the ideal "Aryan" was blond, blue-eyed, and tall.

https://encyclopedia.ushmm.org/content/en/article/nazi-racism

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