District of Columbia

[True Federalist (진정한 연방 주의자)]

DC is not a state.  The non-voting delegates of the District and other territorries actually do get to vote, but only on the committes and sub-commitees they sit on, so they do they do wield some minor influence.  The district gets its special status of having electors because of a constitutional amendment.  While it is possible that another amendment could be passed to allow the district to elect a Representative, giving it Representation in the Senate without it becoming a State would require all fifty States to approve the amendment.  Another possibility would be for Columbia to become a State or to revert to being a part of Maryland.  The problem is tho, that Washington is dependent upon the subsidies it gets from the Federal government, so Maryland wouldn't accept it and Columbia couldn't survive as a State of its own, even assuming that Congress was willing to give up its control over the District.

[True Federalist (진정한 연방 주의자)]

Small  correction:  The Northern Marianas do NOT have a non-voting delegate.  They have a quasi-independent status of free association. which gives them more control over their internal affairs than orsinary territories or even Puerto Rico.  (A similar free association status has been proposed as something to add the next time Puerto Rico has a remain as we are/statehood/independence referendum.)  As a side effect their "resident representive" gets treated more like a ambassador than anuthing else.