I found this thread by Michael Harriot fascinating.

There is the strongest reason for believing that the first movement toward amalgamation in this country will take place between Irish and Negroes.

Does any of this sound familiar?

So how did they become white?

Well, basically, it was because of Gangs.

And this thread by Latif Nasser was equally fascinating, where geological movements and social movements intertwine.

Jackson’s death galvanized the Civil Rights Movement, inspiring the legendary Selma to Montgomery Marches the next month. The ground they marched on contains what geologists call Selma Chalk, which also dates back to the Cretaceous.