You need a constitutional amendment to make DC a state. Not going to happen.
No you do not need a Constitutional amendment! The Constitution just says the can add states.. does not talk about amendments or how many votes are needed. But since they will do away with the filibuster it will be easy and we can’t stop it!
No, you can’t add DC as a state. It is the seat of the federal government, per
Article I
Section 8
Clause 17
To exercise exclusive Legislation in all Cases whatsoever, over such District (not exceeding ten Miles square) as may, by Cession of particular States, and the Acceptance of Congress, become the Seat of Government of the United States, and to exercise like Authority over all Places purchased by the Consent of the Legislature of the State in which the Same shall be, for the Erection of Forts, Magazines, Arsenals, dock-Yards, and other needful Buildings;–And...