While we know of countries balkanizing, is there any such thing as lower-level balkanizing? Like, some regions within a province balkanizing, becoming their own province while still staying a part of the same country, a neighborhood within a city leaving the city and becoming its own city, while still remaining part of the country, etc.
West Virginia splitting out because it opposed slavery is a good one. Also, the Soviets redrew or split out autonomous republics quite often.
If you have ascended to the plane of unbothered where you have time to enter politics in order to increase your treat supply you should be precluded from doing politics
Never have I believed another person deserved to starve to death.
Until now.
rich parts of cities often enough split from poor parts of cities in america.
Nunavut was separated from the Northwest Territories as a compromise on First Nation land claims. You could maybe count Kosovo and Vojvodina separating from Serbia, because Serbia was part of Yugoslavia. Though only nominally at that point
Surprised nobody's mentioned Medieval Europe after the fall of the Western Roman Empire. The state apparatus collapsed and landlords filled the power vacuum, turning large Roman provinces into dozens of independent regional powers. Over time this system consolidated into a handful of larger kingdoms but that process took about a thousand years, during which time large powers rose and broke apart over and over again.
You have something sort of similar. Louisville Kentucky did a city-county consolidation when Louisville was about to become majority black to maintain white hegemony. I know it's the opposite of what you're looking for but its sort of a similar process. Also numbers of new cities have formed in the US in the last decade, mostly in the South, as richer white neighborhoods have ceded from their cities so they can game tax laws for the most part. Sadly cannot remember examples atm.
County Wicklow split out of County Dublin in 1605. Prior to that Meath had part separate forming Westmeath