Basically everything that is running bad in Africa is a direct result of european imperialism.
And how long is that excuse valid for? It's not like Europe has been very peaceful and tripped Africa up on purpose, we've started two world wars in the last 100 years on our own turf. Yes, I realize problems don't go away in a day or a year or even a decade but look how far Europe has come in the last 70 years. How far has Africa come? How much aid money, emergency relief, how many education and healthcare programs have they gotten for free?
Still trotting out that old excuse and blaming the white man for all their woes is probably going to backfire. It only nourishes the people who think Africa is the way it is because they're primitive deadbeats who can't get anything done on their own. It's not that there's anything wrong with the people as such, take a black man and put him in a different environment and he might end up as President and a Harvard magna cum laude graduate.
My impression is that most of Africa's problems are cultural, like for example the response to Ebola. If they'd just stop touching their dead and seek medical help they'd do fine, but through ignorance and indifference and working against those trying to help them they'll just let it spread. Like HIV, there's a reason it's a huge problem south of Sahara and practically nowhere else and it's because for some cultural reason they just don't seem to value safe sex.