Agreed, with that being said everyone knows (or should know) HipHop is solely a Black creation, and I say that as a Puerto Rican.
see, what most people fail to understand is that in NYC , in those days, while technically living in the same hoods, the 2 cultures were not close associates. What would happen is that you always get a handful of latins (cubans and ricans prior to hiphop era and mainly ricans during hiphop) would attempt to explore Afram culture and at some point would get invited in by Aframs. What also ended up happening because Afram musical culture was the dominant form in not only NYC but the USA at large, Latins had to rock with Aframs if they really want to get on. This is how Latins made it big in Afram jazz circles (1920/1930/1940) prior to the Mambo Big Bands (late 1940s into 1950s) and later, Salsa (1970s) which were heavily based in Afram Jazz scene
.....this is the same reason why puerto rican youth of the 1960's went high and far out of their way to craft a music (the first mainstream latin pop music genre) that displayed trapping of afram life/musical culture
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samething would happen later in Disco; aframs innovate/pioneer-->ricans show up later after being invited in and then open the flood gates for their people
...and then people think Ricans were there from the start
club 371 was a black club/disco
aframs weren't going to no latino clubs