Map I made:
You make up the description
People in the U.S. get tired of having to count to fifty, so they rearrange a bunch of state borders until there are only a dozen or so. Somewhere along the way, British Columbia gets shuffled in by mistake, but the Canadians agree to swap it for Maine, so that's OK. When Arizona and New Mexico heard that they were going to end up as part of "Big Texas," they snuck out the back door one night when everyone else was asleep and joined up with Mexico instead. Mexico considers this only fair considering what happened to Baja California.
The reanimated corpse of Simon Bolivar rises from his grave to rebuild Gran Colombia, defeating Hugo Chavez in a beach volleyball match along the way. When he hears the news, Fidel Castro has a stroke and dies. By virtue of an ultra-secret treaty, this makes Cuba a U.S. state. A wave of random annexations sweeps South America in the wake of Zombolivar's victory.
On the other side of the Atlantic, the United Kingdom and France get together and decide that it would make absolutely no sense if Britain were to give Scotland and Cornwall independence while picking up Brittany, so they do that. Italy takes control of Tunisia by threatening to kick Sicily at them. The Baltic nations have an accident involving a bottle of superglue and end up inextricably stuck together. Further south, time begins running in reverse The Czech Republic gets back together with Slovakia, and Austria and Hungary hook up again, and Yugoslavia reassembles itself. Russia freaks out.
Israel achieves its longstanding ambition to look vaguely like the letter 'J'. Iran and Iraq realize they actually have a lot in common. The new nation of Iranq promptly divvies up the 'Stans with Russia, but it's not like anyone will miss them.
The inhabitants of South Korea look at the world plunging into insanity and conclude that the only logical course of action is to surrender to North Korea, since they have far more experience with this sort of thing. China, India, and Japan try to pretend nothing is happening.
Down Under, the Australians and the New Zealanders discover that after years of confusion they
were in fact the same thing. They celebrate this discovery by barbecuing hundreds of sheep and thousands of jars of Marmite.
Stuff happens in Africa, but no one cares.
Look, what was the point of this?
