Lexicus
Deity
I'd agree it wasn't but its purpose, openly admitted by the Nazis was to encourage them to leave Germany, not to retain them as an underclass.
Yes, and I think that probably springs from the fact that Jews were something like half a percent of the German population in 1933 whereas black people made up somewhere around 15% of the US population, obviously heavily concentrated in certain areas where they made up a majority of the population (e.g. the state of South Carolina). This means that black people were an important source of labor - wholly removing them from US society would have been extremely difficult.