American Civil War/Reconstruction ATL's?

Does anyone have any recommendations for alternate timelines featuring the American Civil War or Reconstruction (doesn't have to be specifically about the war though)? I'm most interested in TL's featuring foreign intervention in the war, but anything is good. Unfortunately, the forum search function hasn't been too helpful.

My only criteria are:
  • Main cause is still slavery.
  • Roughly the same time period (anytime during the 19th century using roughly the same technology is good, but the closer to OTL the better).
  • No ASB (i.e. no time-traveling or whatnot).