Why did racism strengthen the acceptance of slavery?

Racism leads to the belief that one race is better or of "higher-standard" than another. The race that is "master" would then, obviously, be able to subject other races, including making them slaves (people who work for them without pay). Because of racism, they believe that lower-class races would need to be obligated to serve higher-class races, or Aryans.

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study of past cultures

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.