I've kicked around this idea with Tokyo with no response. That's okay; I think it's a loose situation that occasionally shows up in anime and not even all that often. (specifically in Neon Genesis Evangelion, but that was more like a couple iterations of the city getting destroyed, and due to supernatural reasons in Rahxephon, which is a very NGE-influenced series anyway).
But there is at least one real world example- Berlin, after World War II, (but still not as fun as if it's Berlin vs. the rest of Germany) and in AH the fate of Russia in the Turtledove short story "Les Mortes d'Arthur": there's a People's Republic of Moscow which is separated from neo-tsarist "Siberia", which is the rest of Russia. Though based on this wiki it's more like an east vs. rest division, and not like the greater Moscow metropolitan area vs. all of Russia, which is what I had imagined when I first read the story. Still, branding your rump state after one city is still very interesting to me, it hints that their rump state is most renowned for holding on to the capital, because otherwise not call yourselves the Soviet Union still?
So yeah let's think of situations where a city's capital becomes an enclave controlled by a different government from the rest of the country.
Maybe an anti-decolonization thing? Cape Town as the only city of a Boer Volkstaat, Algiers as the last stand of French Algeria (wouldn't Oran or Constantine be a better pick?)? Rump Republic of Vietnam in Saigon instead of Vung Tau? Kabul somehow remains in the hands of the Islamic Republic of Afghanistan (absurd)? Or what if Monte Carlo secedes from Monaco.
But there is at least one real world example- Berlin, after World War II, (but still not as fun as if it's Berlin vs. the rest of Germany) and in AH the fate of Russia in the Turtledove short story "Les Mortes d'Arthur": there's a People's Republic of Moscow which is separated from neo-tsarist "Siberia", which is the rest of Russia. Though based on this wiki it's more like an east vs. rest division, and not like the greater Moscow metropolitan area vs. all of Russia, which is what I had imagined when I first read the story. Still, branding your rump state after one city is still very interesting to me, it hints that their rump state is most renowned for holding on to the capital, because otherwise not call yourselves the Soviet Union still?
So yeah let's think of situations where a city's capital becomes an enclave controlled by a different government from the rest of the country.
Maybe an anti-decolonization thing? Cape Town as the only city of a Boer Volkstaat, Algiers as the last stand of French Algeria (wouldn't Oran or Constantine be a better pick?)? Rump Republic of Vietnam in Saigon instead of Vung Tau? Kabul somehow remains in the hands of the Islamic Republic of Afghanistan (absurd)? Or what if Monte Carlo secedes from Monaco.