Looks like DC statehood is pretty easy. Manchin says we need a constitutional amendment to do it, but he's clearly wrong about that: No state has EVER been admitted by constitutional amendment. The process is included in the constitution already, and it does not mention an amendment requirement. It's mostly up to the people living in that territory. They can vote on a new state constitution by simple majority, and then a simple majority vote to admit in each house of congress is all it takes. It got a little trickier when new states were carved out of old states, but that's not the case for DC.
DC would have a larger population than Wyoming or Vermont, and I suspect a statehood vote would pass easily. The size of the federal district has already been adjusted once, when some land was returned to Virginia. So that has precedence.
Just as easy to admit Puerto Rico, if the boricuas could get their act together.
We're flying electric helicopters on Mars yet you can't turn on your clothes dryer in Texas. That's because scientists are in charge of Mars, and Republicans are in charge of Texas.