Actually in order to have Black Nationalism, there has to be plans to build a Black Nation. Although there are countless books and articles articulating how this can be done, very few if any have actually attempted to create a nation (nuwabians, NOI, African Hebrew Israelites.) Unfortunantely all of the organizations who have actually tried to create a nation are not African centered organizations. They all espouse Arabic or Hebrew nationalism.

In order to have a nation the following criteria must be met:

You must have land
You must be an exporter of goods and services
You must have an arm of defense for the nation
You must have a governing body to regulate the people and resources and
You must have a systematized way to educate your people and have methods of research to advance your educational system.

If you do not have all of these variables working simultaneously, then you do NOT have a nation. No nation, no NATIONALISM. So Black Nationalism failed before it began because these were not in the works. You cannot build a NATION inside another NATION. It's impossible.