well just for the record, this is completel theoritical, there is no way a black american nation would ever happen for many different reasons
but what you said is a good case for saying that a black american nation would be better off than a typical african nation, but a black american nation would be equivalent to mexico and other "emerging" countries, it wouldnt be all the way at the bottom but it wouldnt be at the top, and a black american nation would be facing pretty much the same problems as mexico or brazil typ countries
my point is is that there are 2 basic metrics that determine wealth of a nation , those are levels of education and levels of capitalism, other factors come into play of course ut those are the most important factors
places like howard and spelman are good steps but overall black americans are way behind in education even (compared to the us and europe), so a black american nation would also be way behind
where my opinion goes to left field, compared to some people, is that people assume if you remove the white presence those things like education would improve, i dont think it will, IMO to improve black education there are cultural shifts that black people have to make irrespective of white people, ie irrespective of black nationhood, if we dont make these shifts we will be at the bottom regardless
(1) Your initial point was that Black America nation/state would be a third world nation. I gave you specific points why it would NOT due to the different mentalities/problems that people in the third world face in comparison to Black Americans. Now your rebuttal is how theoretical the proposition would be (that's another argument/issue in itself)
(2) Secondly Brazil and Mexico are not in the same categories. Brazil is heads and shoulder above Mexico and is still economically improving (it is the 7th largest economy in the world, part of the G20 nations). Of course no country in the world is at the level of the United States or Europe YET that's because they are some of the oldest democracies in the world and everybody else in the world used to be their subjects up until recent history. I rather be "emerging" and building something on my own than be under a system of white supremacy. Even if you get an education as a black person, you are still less likely to be employed as your white counterpart with the high school education. These are FACTS done according to studies. When these FACTS support what is prevalent when living under a dominant advanced society, a rational person is going to take that risk to be on their own and build something of their own even if that means leaving the comfortable advanced society where he/she has been considered a second-class citizen in the entire history of that society. It's like being at a dead end job because you see other people less qualified than you get constantly promoted. Are you going to stay because the dead end job still provides a steady paycheck but does not respect your abilities or are you going to take the risk in starting your own enterprise to compete despite the fact that it is going to take time to be at the level of your current employer.
(3) Getting an education was the blackest thing you could do. When you study the civil rights movement, the first court cases and initiatives in order to desegregate were not based on trying to sit in the same lunch counters or frequenting white establishments but having access to education(i.e Brown vs Board of Education, Arkansas/Little Rock Nine or the gentleman who wanted to desegregate the University of Mississippi, these are the popular court cases but you will find tons of court cases around the country where essentially black students were trying to integrate because they wanted the same access to education as whites that is because state public institutions were getting money however schools in black neighborhoods were ignored hence the poor quality of these schools, overcrowding, lack of good textbooks etc ... Today, I agree there is less of a culture of getting educated in many black communities ironically we get to walk around and frequent white establishments and no longer excluded out of restaurants because of the color of our skin. I truly believe that integration being around white people as much had a role to play. I rather struggle build my own nation, repair the ills and wrongs of our culture than BE UNDER WHITE SUPREMACY SOCIETY.