Here's another example of a successful black state: Botswana. Their GDP per capita is similar to Russia's, but they have a fraction of the corruption.
In the transparency and anti-corruption rankings, they rank as cleaner than Portugal, Poland, Israel, Lithuania, Slovenia, Spain, South Korea and hundreds of others. See
http://www.transparency.org/cpi2015#results-table
In their first twenty years after independence they didn't even have an army because they thought it was a waste of money. They have a small one now which is used for peace keeping missions. Needless to say they have never been to war.