Not really. But it might be interesting to hear if anyone had any thoughts in this area.
I know US states can’t be merged in any practical sense (not sure about split, since W VA?) but what about moving state boundaries? Are there any moves that might make sense? Say, getting rid of an odd strip of land like a panhandle? Or accommodating a city which has spread over the border to another state?
ISTR there’s at least one place where a river has moved away from the state boundary, and there are isolated pockets of one state on the other side of the river now.