Deutsche Welle spoke to leading German historian Prof. Reiner Pommerin to find out what happened to these children. “I published a book in the 70s, which told the reader about the sterilization of mixed blood children. These were children who had been fathered by occupation forces — mostly French occupation forces,” he said. His book, “Sterilisierung der Rheinlandbastarde. Das Schicksal einer farbigen deutschen Minderheit 1918 – 1937” (“Sterilization of the Rhineland Bastards: the fate of a colored German minority 1918–1937”) publicized the sterilization of the Black minority in Nazi Germany.

Prior to the publication of the book in 1979, this information was unknown to the public. The sterilization of biracial children was carried out secretly because it went against 1938 [Fascist] laws and procedures. The exact numbers remain unknown, but it is estimated that 400 children of mixed blood were sterilized — most without their knowledge, Pommerin said.

Today, the fate of the “Rhineland Bastards” still remains largely unknown. The lack of public knowledge regarding their fate may have to do with the “lack of public interest in minorities,” said Pommerin. Campt attributes it to the secrecy behind the sterilization program and the nature of the Afrika Schau. “It has to do with the status of the Afrika Schau as a spectacle. So that was set up as a visual spectacle that was supposed to get people to notice something as a display. In that way, it was really publicized in order to get people to think about,” she said.

(Source.)

Further reading: Hitler’s Black Victims: The Historical Experiences of Afro-Germans, European Blacks, Africans, and African Americans During the Nazi Era