Try reading the Constitution.
Article I, Section 8, Clause 17
The Constitution established the district. How do you amend the Constitution?
Actually, a new seat of government would have to be established as well if DC were made State. The district of the seat of government is separate from the States as noted above.
Which State do you believe would sell ten square miles of their land?
You good?
Where in there does it say that you can’t make a state out of it? Even though I know they shouldn’t.. The Democrats don’t believe in the Constitution and have no reason to follow it even if it did say you need 67 votes or what ever to make a new state. They will not follow it..