RealClearHistory. Hiding there in plain sight. (With maps. Lots of maps.)
For a while now, I’ve hung around over at RealClearPolitics. For a poly sci junkie, it’s a great place to spend a few minutes or a hundred, digging into polls, commentary, and election gossip. But it wasn’t until a few weeks ago that realized that the RealClear network of sites also has a History version.