Second, there are several other countries that are called United States of . Most notably, the Toxi Holi Hai Colorful Mug In addition,I will do this next-door neighbor, United States of Mexico. Yes, the full name of Mexico is Estados Unidos Mexicanos. We call people from there Mexicans, which sounds pretty similar in how it came to be. Calling people Unitedstatesian would be confusing – which United States are you talking about? This is an interesting question because it really shows how poorly we teach American social history, even to teachers. A big reason black Americans adopted the “African-American” label is because the majority of them do not know what their country of origin is because their ancestors were brought here as enslaved people. That Africa was not at the time divided so neatly into “countries” as Europe is a smaller factor. But it was a matter of recognizing that they do not — cannot — know where their ancestors lived with much more specificity than “Africa”. Most Americans of (primarily) European ancestry want to identify with their ancestral country(ies) of origin; that’s why we have Hibernian Halls, Knights of Columbus, Polish-American community centers and other organizations devoted to people from specific countries in Europe (not to mention the mountains of “Kiss me I’m Irish/Polish/Italian/etc. merchandise).