Which, I think, is fair, as South and Latin are also America. And so is Canada. And so was Francis.
But I usually find it a hard concept to convey to my fellow local USsians.
In Anglo cultures, there are seven continents, with a distinct North and South America, and Europe and Asia.
In Romance cultures, there are six continents, with a single America, and a distinct Europe and Asia.
In some eastern European cultures, there are six continents, with a distinct North and South America, and a single Eurasia.
Who’s right? Who’s wrong? It’s kind of meaningless; it’s not like these definitions are based on some semi‐objective characteristic like counting tectonic plates. In the Anglosphere, nobody is actually confused about whether “America” refers to the country or the continents. Canadians don’t appreciate being called Americans, and (in my experience) Mexicans don’t desire it either. If one wants to refer to North and South America together, there’s a perfectly normal way to do so: “the Americas.”
USian, aside from its lack of euphony and its general connotation of being used by know‐it‐all scolds, is particularly silly since the existence of two countries named “United States”—two North American countries named “United States”—means it’s just as ambiguous a country name as “America” is claimed to be.
Even though I consider estadounidense silly (why aren’t people of Estados Unidos Mexicanos considered estadounidense, exactly?), I use it when speaking Spanish, because that’s the way people say “American” in Spanish. I don’t explain to Spanish‐speaking people how ignorant they are for using such a silly, ambiguous word. One wishes the same courtesy were offered in the other direction!