Taxation without representation. I'm pretty sure an entire war was fought about that.
In all seriousness, though, the reasons why DC wasn't a state at the country's founding are no longer valid, and the only reason DC isn't a state now is because it's 45%+ black.
Yeah, you don't get automatic citizenship in American Samoa, but if you're born to American parents anywhere, you're a citizen, you just have to file a CRBA, which you can do via the internet, mail, whatever. It is bullshit that it costs $100
Even if jus solis didn't apply, if you are born to an American citizen literally anywhere, you're automatically an American citizen. Of course you do kinda have to be registered at some point.