"Black" ("racially") is a range of Phenotypes, a Phenotype that originated on the African Continent.
Many Puerto Ricans and Dominicans conform to "Black Phenotypes", as well as have Recent (within the last 400 years), West-Central African Ancestry.
Does that make them Black Americans ("Ados/FBA/Freedmen")? NO.
Would that make them(the ones with Black Phenotypes) "Afro-Latinos" AKA "Black Latinos" YES.
The "Confusion" comes from people who don't "understand" the different between "Black Racially" and "Black Ethnically/Culturally".
9 times out of 10 when someone is talking about "Black Culture" they are Primarily talking about Black American culture(s).
There are also "Non-African Blacks": Melanesian, Negrito, Australoid etc..., who though are "100% Eurasian", also got/retained their "Black Phenotypes" from Ancient African origins.