Listen to Logan Jackson’s story: “Dan Porter was an old Civil War veteran. I was a little boy. At the time we met, they were enforcing the Jim Crow law, which said black men could not vote. ‘Man told Dan Porter, says, ‘Don’t you go in there and try to vote.’ Says, ‘You can’t read.’ “Porter says, ‘That don’t make no difference. I’m one of the men who made General Lee surrender!’” Logan stared into the faces around him, ‘You don’t know who General Lee was, do you? He was a general in the Civil War. Yeah, an old soldier.’ Well, Dan, he voted.”

How a diverse group of Americans succeeded in living together is a fascinating tale that has made an extraordinary difference for the millions who came after them. Of course they had racial problems, and still do, but the way they worked them out holds lessons for our own time.

One of the most diverse places in America is not where you might expect. Oklahoma once had 28 towns settled by former slaves, scattered throughout 37 Indian Nations. For nearly a century it was primarily a land of the Red and the Black, a checkerboard of Indians and ex-slaves who very nearly got their own state until thousands of immigrants from around the world joined them seeking free land — land they got in a single day.