I did just read that statehood is a simple majority bill through both houses of Congress and the president’s signature. It does state that historically the people of that territory voted in an election to declare their intent to join the US, but I wouldn’t put it past the Dems to just ram it through, damn the torpedoes.
Washington, DC residents have already voted a few years ago on a draft Constitution, 70% approval. Has a DC bill been entered yet? The PR votes are much more subject to interpretation.