"They said that it would never happen, but it did. When California seceded from the Union, a domino effect set off. Within a month of this happening, all that was left of the Union was the Midwest, western Pennsylvania and New York, Virginia, Maryland, and New Columbia. Although most of the states had seceded, the borders were not fluid. On the East Coast, originally the most successful states were New York and the Commonwealth of New England, a confederation between the six New England states. In economic competition, most pundits and observers believed New York would triumph due to its larger population. However, upstate New Yorkers felt that independence for New York had not solved their problems, and the country fractured. The original Republic of New York currently only holds onto part of the New York metro area. In the process, New England annexed the Plattsburgh area and added it onto Vermont to balance its low population. Presently, New England and California are the most prosperous of the many American breakaways (not including the U.S. itself). It also bought a few border islands from Canada as a diplomatic action; the two are currently in a military and economic alliance. A few radical members of the New England Parliament are considering a union with Canada, but support for this is low in the newly independent nation. However, as the 2010s have shown, anything is possible."
(note that this is not a partisan map, I started it before Election Day)