Have there been any instances where one US state has exchanged or ceded land to another US state, subject to the conditions below? If so, what led the exchange?
- I'm asking about states, not territories
- The exchange or cessation is not related to the creation of a state or territory
- It's voluntary
- It's not the result of something like a border dispute, due to inaccurate maps at the time of demarcation
- It's not the result of a shifting river or other natural feature used for demarcation
- It's a "significant" amount of land--so let's say at least a few square miles (I'm more interested in larger land exchanges but don't want to list an arbitrary number here--this is more to exclude the type of exchange where I read that Minnesota gave 20 acres of land to North Dakota in 1961 here.
I couldn't find any examples in a quick look over the wikipedia page on territorial evolution of the US, but perhaps I missed something or the page isn't comprehensive.
Edit: Perhaps these conditions seem arbitrary, but I'm looking for any cases where, for example, land was exchanged for money or other land which is mutually beneficial for both states, without explicitly limiting myself to those circumstances. This question was influenced by reading about the Toledo War where Michigan gave up the Toledo strip to Ohio in order to gain statehood, but got the upper peninsula from congress in exchange. Maybe there were times when already incorporated states had similar land gain?