You're quoting wikipedia rather than looking at how the word is used. Look at any anti-racism activist organisation, and you'll see in about 10 seconds of reading that the term is not only used for minority groups in the US, and the US specific use has long since evolved into a general term for all People of Colour. I mean the dictionary definition says the term originated in tbe 18th century to refer to anyone who was not white, it fell out of use and was then revived in the 1990s and has since become more widespread. Ofcourse if you were actually keeping up with activist groups and current preferred terminology, you'd know the that big debate of the momemt is whether or not to switch from POC to BIPoC. There's a certain amount of controversy surronding that one, as it was originally coined to be used in cases where Black and Indigenous PoC had common ground and were targeted in a specific way by racism, then very swiftly began to be ised in some circles as a replacement for POC. POC itself has not been without controversy, as some people who fall under that ymbrella feel that it flattens or homogenises the experiences of people who face racism in different ways, and prefer to use specific identifiers.