With as late a POD as possible (I'm in this forum because I don't think that anything so late as 1900 is possible without great big bats. Losing Hawaii before statehood doesn't count, and I'm not interested in extreme Axis wanks either), have the United States sign a peace treaty that cedes control of the entireity of at least one state to another nation which cannot have ever itself been part of the US. (I.E. no loses to the Confederacy, even in follow-up USA/CSA wars, count for this challenge.)