> It is more or less “USian” in some other languages, and no one raises an eyebrow. 美国人, 米国人, etc. Given that both of those examples come from phonetics for Am

> It is more or less “USian” in some other languages, and no one raises an eyebrow. 美国人, 米国人, etc. Given that both of those examples come from phonetics for America I don't think that proves what you think it does. It's not 合众国人 ...