How did black germans affect history in holocaust?

The fate of black people from 1933 to 1945 in Nazi Germany and in German-occupied territories ranged from isolation to persecution, sterilization, medical experimentation, incarceration, brutality, and murder. However, there was no systematic program for their elimination as there was for Jews and other groups.

After World War I, the Allies stripped Germany of its African colonies. The German military stationed in Africa (Schutztruppen), as well as missionaries, colonial bureaucrats, and settlers, returned to Germany and took with them their racist attitudes. Separation of whites and blacks was mandated by the Reichstag (German parliament), which enacted a law against mixed marriages in the African colonies.

from the conditions of the working class in england by friedrich engels,the main idea is :