Likely to be Puerto Rico, Guam also in this discussion.
In the DC discussion...it’d be a lot easier to just release SE DC and Georgetown areas back over to Maryland....like Alexandria/Arlington was flipped back to Virginia around 150 years ago.
Perhaps the better answer here....allow Texas and fifteen other states to exit, then allow DC, PR and Guam to enter America-Lite.
Maybe we can get the Carolinas and the Dakotas to reunite.