Membership in the community obligates someone to communal action--the identity itself elevates the individual through those obligations, not despite them, and certainly not without them.
It's a far more complimentary (and frankly, tenable) view of American exceptionalism, that Americans are superior not by the virtue of being American, but by the things being American calls them to be. That, of course, goes back to the communal investment in ideals and values to backstop the individual's identity markers. That means that there is nothing intrinsically valuable in being American, but the value comes out of the communal performance of "American." When that performance falls apart, so too does the exceptionalism of the label.
That is also different from an ethno-nationalism (which is typically shot through with subrosa or justificatory religious superiority) and from the explicitly ethnoreligious--nationalism of Israel.