There are blacks in regions of South Carolina (the Gullah) that have maintained some cultural traditions for hundreds of years. Ergo, no one singled out blacks alone, rather it's the normal result of being in the US for hundreds of years.Groups that came here as immigrants can be proud of their ethnic or national origin(ie Irish, Italians, Germans, etc.). Slaves from Africa weren't allowed to carry over to the states any cultural traditions or native languages. They had to leave it behind. So black Americans are unique in the sense that our ethnicity is entirely based on culture and traditions developed in America.
Eg. Jewish immigrants of the early 1900s were often more religious than their grandchildren. The ethnicity of these grandchildren is based on culture and traditions developed in the US, not on those developed in Russia, Europe or elsewhere. These traditions typically include being bombarded with lies about how cool it is to discard those old cultural traditions.
Nothing unique about similar influences on blacks.