Washington D.C. isn't a State for Good Reasons
Some information on why Washington, D.C. was specified in our Constitution to be an independent city, not owned by any state.
"Philadelphia and New York were viewed as unsuitable for this purpose because, in the absence of long-range communication and efficient transportation, it would be a massive advantage for anyone to have the seat of federal power in their own hometown. That city would become incredibly powerful and probably corrupt, and the people of that state would have undue influence over the governance of the country. The writers of the Constitution went far in the other direction, and decided to create a new city (district) out of whole cloth, in which, effectively, its citizens would exchange congressional representation for this valuable proximity to federal power."