My wife and I went to Washington DC this weekend as our very wonderful oldest daughter secured tickets to the new African American History (part of the Smithsonian.) Getting tickets is a difficult process involving a several month wait but it was worth it. The museum takes a chronological track as it traces African American history from beginning of slavery to the Civil War, Reconstruction, the Civil Rights era through to Obama and Black Lives Matter. There is a Pullman car, a lunch counter, and a quite moving Emmett Till exhibit. There are also separate exhibits outside of the this timeline about educational, cultural, popular entertainment and athletic history. (Lebron's foundation was a sponsor of the Muhammad Ali section.) There was a short film about baseball which could be watched from seats resembling ball park seats.
The only downside is the sheer volume of the material makes it impossible to go into depth on a lot of different topics even in the 3+ hours we spent there. It is also quite crowded. I would like to go back, but I imagine it will be several years before one can just walk up and visit without lengthy planning.
I would recommend this to anyone who has an interest in American history.