It raises an important point: Almost every square inch of Earth's real estate has belonged to more than one entity historically. Near current borders we might expect more recent changes of ownership (those borders being created more recently).

Lots of groups try to use these historical claims - some going back thousands of years - to assert ownership of various lands. On that basis, there is no end to it; nobody owns or has sovereignty over any land.

I will also observe that the most prosperous and peaceful have fewer borders: Europe is reducing theirs; the US-Canada border is porous (yes, the EU's and US's southern borders obviously complicate this theory). Russia could have had such borders with Europe; instead they chose power and death over prosperity and peace.