Tramp, try and let this brew in your brain for a few moments before responding.
We are citizens or Citizens if you like as the words mean different things, of the US or "united States" while we have been called americans this is in error as the USA is a combination of the united States and america so follow this usa = united States of america following so far ?
So when someone says USA this means a part of america "of america"
Ok so Canada and Mexico are also countries of america or in actually north america so they are canada of america and mexico of america.
So in reality we are not americans as we dont live in america we only live in a part of north america same as mexicans and Canadians.
The nationality of people if the united states as follows no matter what wikipedia says.
Statute, by birth within U.S.
§ 1401), a person is a United States national and citizen if: the person is born in the United States, and subject to the jurisdiction thereof. the person is born in the United States to a member of an Indian, Eskimo, Aleutian, or other aboriginal tribe (see Indian CitizenshipAct of 1924)