As much as I agree that the UK had significant youth sub cultures the movements you mention are from the 90s and before. The idea that the USA doesn’t have a “huge range and history” of street movements which includes music styles, clothes and sub-culture is just incorrect.
If we are going back then Blues, Jazz, Rock and Roll, Soul, R & B, Glamrock, Funk, Disco, and Country which were all massively influential in the UK, all came out of the USA and had street subcultures, as has Hip Hop, Rap, EDM, House, Techno, Trap, Grunge and Ambient. The UK is still obsessed with American popular culture and music.
I would still question your idea that street culture was coming from the British Middle Classes as in my experience the MC in the UK always got it from the streets or other sub-culture groups that were wearing/listening to something first. There may have been MC kids involved but generally street culture comes out of the working class and and always has. I would agree with @mathanxiety
The Teds, Mods, Heavy Metal, Skinheads, and Punk all had working-class roots.
This doesn’t have to be a competition, all styles and sub-cultures can be recognized. The UK is about as big as California, the USA is a much bigger nation with a range of sub-cultures, racial and ethnic groups and street influences with big regional differences.