One of the big debates raging these days is about whether Puerto Rico and the District of Columbia should be admitted as new states. As recently as 2016, the Republican Party platform favored statehood for Puerto Rico, although most Republicans seem to oppose it today. Nevertheless, the path for a territory like Puerto Rico to become a state is clear, but the District of Columbia is a different case.
I don't think they would need an amendment if they cut out the actual seat of government and kept that separate and then made the rest of the city a new state.
I don't think they would need an amendment if they cut out the actual seat of government and kept that separate and then made the rest of the city a new state.