Statunitian is an alternative nationality form of
American, since this gentilic generates ambiguity with 'inhabitants of the United States of America' and 'people who are born in the Americas (continent)'. It's important to state that Statunitian is not to substitute or eliminate the denonym
American, but to solve the ambiguity of the word. In the international community, most people don't refer to the
USA as America, but rather 'the United States' or similar words.
Similar gentilics are available in other languages (some romance languages) like Spanish (estadounidense), spoken by 460 million people, Portuguese (estadunidense), spoken by 220 million people and
Italian (statunidense), spoken by 65 million people.
Person A: "
Hey, I'm from
Italy, where are you from?"
Person B: "I'm from America."
Person A: "Where in America?"
Person B: "I'm from Temple,
Texas."
Person A: "Oh, so you're a Statunitian."
Person B: "A what?"