The only one, guys.
If your property tax keeps going up but nothing gets better in town, are you gonna trust the tax man?
You just submit that you already paid taxes on that income to a foreign government and then no additional US taxes (to a limit, I beleive).
To which state would one owe taxes to since you're no linger a resident?
Similarly, Americans abroad vote, but ppl in DC (not a state) cant?
Can I avoid state taxes by sojourning in DC before moving abroad?
Generally the rules will be something like you remain a tax resident of your old state, regardless of how long you stay abroad, until you establish a new permanent tax residency (whether in a new state or country).
What I eventually did is return to the US, sign a 1 month lease in Florida so I could get a drivers license and register to vote, and then return abroad. According to my tax accountant, that was enough.
Canada's rules are like that and I like it!
It's not like we give up everything but leaving the country.
And your citizenship allows you to get visas/dual citizenships that you wouldn't have access to if you weren't an American citizen. An American passport is pretty valuable, even if you don't live in America.
This is all less relevant if you move to, say, the EU, but it's still worth noting.