Absolutely brilliant (and terrifying) analysis.

Total repeal of the gains black people achieved in the 1960s is already underway, especially the Civil Rights Laws of '64, '65 and '68.

The one possibility you did not cover, tho, is this: As Trump inches closer and closer to a federal and/or state prison cell, so-called "conservatives" are speaking up very publicly and very loudly and very boldly about starting and winning a second Civil War.

As to the return to chattel slavery, the only question, therefore, is whether or not re-enslavement of blacks (and others) will occur before or after such a war.

Again, 'preciate your alerting us to not just the possibility, but to the ways and means such a thing can become a probability as well.