Botswana is also the least corrupt country in Africa, scoring better than some European countries like Italy, Spain, Belgium!
They had a visionnaire as their leader (reminds me of the famous SIngaporan leader Lee kuan yew),
Seretse Khama — Wikipédia (wikipedia.org)
All Africans might achieve their levels of developpment if we work hard and with great ethics.
They have extremely good leadership as its the highest ranking democracy in continental Africa.
I also think that the lack of interference in their affairs even during colonisation was a major factor in their success. The British largely left them alone compared to their other colonies.