Africa is four times the size of Europe, but its coastline is only one and a half times longer than Europe's. You need good access to the sea, plenty of natural harbours and navigable rivers for trade;

Much of Africa lacks all three.

Switzerland can be accessed from Rotterdam via the Rhine River. (Switzerland is the most inland nation in Western Europe). Rwanda, on the other hand, can only have meaningful access to the outside world via a heavy duty freight rail - which might not be built in our lifetimes.

Economists (like Nobel prize winning Paul Krugman) have written about Africa's unique problems. To get Africa to work as economic entity - there has to be massive investment in infrastructure;

But nobody has the money or the desire to make that happen.

Trade between Angola and Tanzania is only a paltry $500,000. One reason is that there's simply no reliable overland link between Angola and Tanzania - and it is better for both nations to trade with partners who are accessible by the sea - i.e. someone else.

As for navigable rivers - there's the Nile (only in Egypt and Sudan) and maybe, the Congo - but with cataracts on the approach to the Atlantic Ocean, it is basically useless as a trade route.

Wealth is a product of trade. Trade is a product of logistics. Logistics is not a matter of "proclamations" or "Pan-Africanism". You either have road, rail, canals, navigable rivers etc - or you don't.

This is advance warning, because poverty is Africa's default state.