Ok. How about other African countries that have had peace for 30 years, why do they struggle to build infrastructure and require the Chinese to do it?
Why do you think that is? You really think it's because they cant grasp the knowledge?
Its corruption and mismanagement simple answer.
Most african countries have dictators at the top and corrupt foreign corporations have them in their pockets. If you want to know what corruption and mismanagement of resources can do to a country look at Venezuela.