On April 22, 2021, the Democrat-led House of Representatives passed a bill paving the way to grant Washington, D.C. statehood. This has long been a Democrat party goal in order to gain two more Democrat Senators. The touted reason for this change is to grant citizens of Washington D.C. the same representation and voting rights as citizens of states.
Article 1, Section 8, of the Constitution established a federal district independent of any state. The Founders established such a federal district because they didn’t want states interfering with the seat of federal government. It would probably take a constitutional amendment to change the situation and that is not likely.
There is a simpler processes to provide residents of the federal district the same representation and voting rights as citizens of states. That is to redraw the boundaries of the federal district which Congress can do. Residential and business areas of the District of Columbia could be ceded back to the state of Maryland. Washington, D.C. residents would then become citizens of Maryland with all the voting and representation rights enjoyed by other citizens of Maryland. Only the two to three square miles that contain federal buildings and the National Mall would remain as an independent federal district. That, of course, would frustrate Democrat goals of power. Perhaps the citizens of Washington, D.C. could take a vote on whether to take this alternative or to remain as is.