Really? Take Zimbabwe as an example. Once one of the richest and most productive countries in Africa. Now an economic disaster. Why, because of rampant corruption by the Africans running it. A pattern sadly all to often repeated. Please explain how that is the fault of the previous colonial power.
Zimbabwe is, indeed, a very good example.
The present corruption of the country is a consequence of having
natural development put on hold for a couple of centuries. They are in
an infant state, regarding the development of national hierarchy and
mature authority. Not helped, by their despotic dictator who held,
undemocratically, on to his position since we so graciously gave them
their independance. It was us, incidentally, that put that dictator in place.
Perhaps, if we hadn't interfered in the first place, the country as we have
come to know it, wouldn't even have existed. It was us, who set off around
the world, arbitarily drawing borders wherever it suited us. The concept
of "countries" & "borders" is entirely notional and fabricated.