Elements of culture are (or were) unique to nationality, perhaps, and even that is extremely loose. As soon as people started moving between nations, culture began to mix. And of course even those nations were a composite of other cultures.
As far as race goes, nothing is unique to it. It's a meaningless, floating construct. Someone who is Colombian is considered 'hispanic' and 'non-white,' yet they are genetically part white, roughly half, some more white, some less white.' And 'white' doesn't mean a god damn thing either, it covers countless ethnic groups. At one point Italians and the Irish were considered black. Now they're considered white (by most, anyway.) Black Americans visiting Africa are often seen as white by the native Africans.
And let's pretend all of that isn't the case for a moment, and let's say that 'black' people created the blues with no outside influence whatsoever. Even then it's still a false statement, as it was a uniquely American affair. Blacks in Africa, the West Indies, South America, and countless other locations had nothing to do with its inception.
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