ha ha only serious; ask them for their papers and if they say “who the fuck are you?”, they’re americans! a slightly more serious answer: you largely don’t. Th

ha ha only serious; ask them for their papers and if they say “who the fuck are you?”, they’re americans! a slightly more serious answer: you largely don’t. The US doesn’t have a national ID, proof of birth is not even close to standardized, etc.