[gandalftb]

“a citizen both of the state and of the nation, or dual sovereignty.”

US citizens are sovereign to the United States republic only. They may be residents anywhere in the US, and not necessarily in any State.

One could live in WA D.C. or a territory or an overseas military base and have an unconditional sovereign citizenship.

I was born in the territory of AK and had to do nothing to be a full citizen.

[pierrem15]

Not quite sure what you mean. You were born in a territory of the US and under American law that made you a citizen of the US. There is one territory now where that is not the case: American Samoa. When AK became a state or you took up residence in a state and not a territory you also became a citizen of that state.

I'm thinking of things such as consular notification, where SCOTUS has ruled that the notification is required only if a foreign national is arrested by the US government not a state, since the treaty is with the US government. States can also possess sovereign immunity against lawsuits in their own courts, etc.. US states still have a limited kind of sovereignty, much more so than in other federations, such as Germany.