I don't know that I'd paint such a binary picture. Trump gained black voters in 2020. We forget how conservative black folks can be. I did find this:
Black Party Affiliation African Americans have a history in both major political parties of the United States. After the Civil War almost all Blacks considered them-selves Republicans. It was the Republican Party that was started by abolitionists and of course the party of President Abraham...
blackdemographics.com
Which I think would show 2020 continuing the same trend since 2008. It shows more people leaving their red/blue party affiliation, but of those that leave, that group leans more red.
This is why the left should have embraced law enforcement, especially after 1/6. They haven't done that at all. It's a missed opportunity that could cost us the country. With law enforcement being predominantly right and with about half the the right being completely crazy, and with the left telling them they're pieces of shit everyday, who are you really fighting for at that point? They'd just fold and assimilate with the heavily armed people that have had their back on the job.
That always is the end game, get rid of everyone that doesn't look and/or think like me. Most of the world would be on the left's side with any type of infighting, but with a bunch of crazy rednecks in charge of military branches, their hands would be tied. Then again, at that point it'd be like the nazi's all over again and you know that any group of crazy nationalists are never satisfied keeping to themselves. Easy to slippery slope our way into global chaos.