I'm sure this is a stupid question, but after a few minutes of googling I am still unclear on the answer so I thought I'd ask it here. I am about to start stud

I'm sure this is a stupid question, but after a few minutes of googling I am still unclear on the answer so I thought I'd ask it here. I am about to start studying in the US (college), so I was wondering if the USDS accepts non-American citizens? Even without a green card? (I'm British, btw).