@richardmurray
Those are institutions/organizations, NOT a community.
Using the definition of community from both Merriam Webster (definition 1 ) and also using the description of Umoja
on page 158 refers to "Oneness." See Linguistic Dilemmas of Afrocentricity The Diaspora Experience Ali A. Mazrui | State University of New York, Binghamton, New York Alamin M. Mazrui | The Ohio State University, Columbus, Ohio. A community is a group of people with shared interests and likeness.
The Black community continues its growth stage. It quickly becomes a large, diverse, decentralized, peer-to-peer networking community.
The Black population in the USA is 46.8 million strong (second only to German-Americans at 49 million people here in the U.S.)
Further, these individuals, many whom are immigrants, have chosen to identify as Black/African American. These individuals self-identify as Black, which is what makes us a community. Presently the black community mirrors Del's assessment. Definitely, not the community of enslaved Africans you continue to refer to when you mention war between the states. But it is understandable why newly unshackled Africans needed a central meeting place the laws codified Africans as less than. Still, Institutions and organizations that outlive their usefulness tend to die. And self-directed individuals take their place.
If you're interested in reading about the trajectory of the black community, PEW Research already did the heavy lifting. All that is left to do is independent research to fact-check.