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What would you call Americans? United Statesians?
There are two countries called the United States in North America, there's the United States of Mexico, and the United States of America. People from the United States of Mexico are called Mexicans, and people from the United States of America are called Americans.
And what about people from the continent of North America? There's called North Americans, just like people from South America are called South Americans.
One still occasionally hears “yanks”, but it is quite rare. “Seppos”, one more often hears joking about calling Americans that than anyone actually doing so-and the rare occasions the term is used (as opposed to merely mentioned), are (in my personal experience) self-conscious exercises in derogatory jocularity-related jocular coinages are “Sepponians” and “Seppostanis”
Of course, it is a big country, and terms which have fallen out of general use may be retained or revived in some pockets-I can only describe my own personal experiences