Probably what you looked for is how to get into medical school not how to get into residency.I hope my question is relevant to the topic !
I was searching through FREIDA and i found that most universities require US citizenship if not a permanent residency in the US although i was searching IMG friendly programs ! Is it true or i'm not getting it?!
To get into residency you don't need to be a US citizen or Green Card holder, as the IMG friendly programs will sponsor you H1 or J1 Visa.