Huh? The Vatican is a city-state, if you like, but neither the City of London or DC are; the City of London is under British jurisdiction, while DC is under US jurisdiction. None of the three "own" each other.
A source for what? The claim that DC is under US jurisdiction and that London is under British jurisdiction? Sure; see the incorporation documents for DC here, and observe the ongoing state of affairs in which US law is enforced in DC in US courts.
Huh? The Vatican is a city-state, if you like, but neither the City of London or DC are; the City of London is under British jurisdiction, while DC is under US jurisdiction. None of the three "own" each other.
You have sauce for that?
A source for what? The claim that DC is under US jurisdiction and that London is under British jurisdiction? Sure; see the incorporation documents for DC here, and observe the ongoing state of affairs in which US law is enforced in DC in US courts.