No, your list does not "explain" this, it does not even mention an example of "the poor" being enslaved.In the manner in which we define racism today it most certainly does. Today's "racism" became a phenomena circa the Atlantic Slave Trade. before this, slaves were merely the poor or the captured of any color. "My" very brief list explains this.
And the definition of race is not limited to colour, as I already pointed out.
You implied so, by saying gays and the handicapped are not races when I pointed out Jews weren't the only 'race' considered inferior by the Nazis.I stated nothing about Jews being the only considered "inferior" race to the German. What I stated was that it was the Jewish part of the slave labor that personified the racism. This was true for centuries inside Europe and the Nazi Party was its culmination.
Racism based on a systematic classification is fairly new.No idea where you are coming from. It's actually pretty simple. Slaves are historical. Looking down upon others for their tribe, affiliation, or class status is historical. But "racism" is a fairly new concept and it has its roots in the Atlantic Slave Trade, which by that time, the slave identity was considered a dark skinned position. Long gone was the concept that captured whites were to be slaves (except in that extremely rare occasion).
Distinctions in which groups of people are suitable as slaves arguably began with Islam, which prohibited enslaving fellow believers - we agree there.