The demonym for the United States is American: en.wikipedia.org/…/List_of_adjectival_and_demonym…

Anyone from the anywhere in the Americas could be ‘American’. ‘North American’ would narrow the results further to only people in North America. So ‘North American’ is a more accurate descriptor for people from the United States.

Canada is in northern North America.

The United States is in central North America (central based on longitude).

Mexico is in southern North America.

So people from the United States are Central North Americans. Cenoricans ? Cenoramis?