I am fairly sure that the rest of the world already existed.

No way - at least not back then! Source: am American, and therefore entirely confident that no other nations existed prior to my hearing about them (Christopher Columbus told me so! 😛). And maybe even then… which reminds me, are you so sure that you are real? Maybe you too are in America and just forgot? 🫠

Also, just so we are clear, “American” = “USAian”, definitely no other nations exist on the American continent, nope, no way! (Except Canada and Mexico, and they get a pass as wannabe USA states) 😜