Have you read about the black sailors loading ships in California and what happened to them?
The segregationist were very concerned about black soldiers coming back from the war insisting on their rights. It happened after WWI but the racist policies of the progressive Woodrow Wilson and lots of Lynchings kept it tamped down. This is so little known. The US would not let white men fight in French or British divisions, insisting they have Americans leading them. But were happy to have the black soldiers fight with the allies. And for the first time Black American men had whites men treating them, well, like men. This was a threat to the racial oppression in the South.
They tried the same after WWII and ultimately it failed and the movement aided by black veterans lead to the civil rights act.
US history, centered in the South, from the end of reconstruction till the civil rights movement is by far the ugliest time in American history. Way worse than the civil war. Its not surprising schools dont teach it. Blacks had achieved almost full civil rights. Whites terrorized them out of it.
My dad left the rural south because he could not stand the oppression even though he was a middle class white man and I was made to learn the full history.
I truly thought it was behind us as a young man. But now know better.