Even with retrocession or statehood, you probably still need to carve out the national mall as a federal district and hope that nobody still claims residency there. And you still face the reality that 2 EVs for DC's shadow senators are lost in this process, maybe even the 3rd since DC would barely qualify for an at-large rep to begin with.
Trumpo posted...
Would be new smallest state
We should still do it. Throw in Mariana (Marianas+Guam) and Puerto Rico (PR+Vieques+Culebra+USVI). Upgrade Samoans from nationals to full citizenship if there's no plausible way to throw them in with Mariana.