Well look where they're located - ALL in areas with PLENTY of resources like food, water, trees, etc. Africa is arid and the flora and fauna are minimal, let alone numerous enough to even construct with. Also, since they were much further away than Africa, they were never targets for exploitation by the Europeans until sometime later. Africa was exploited almost immediately as the Europeans noticed the gold ornaments that the African leaders met with.
Not to mention that the other places you mentioned were relatively homogeneous in terms of religion, ideology, and way of life. Africa on the other hand was comprised of thousands of tribes with different ways of life. And all Europe did was force a whole bunch of these tribes into an area and say "GET ALONG". Poof. There's a country. Last time I checked, not the best formula to making a harmonious, working nation. Explains all the political strife in Africa and why they haven't advanced - nobody lets another group take the advantage, and they stop at nothing, massacring other groups just to stay in power.
So basically, the reason Africa's so far behind? The people who proclaim themselves to be "superior", just because they had some metal sticks that shot crap. That Chinese technically invented.
I think that killed your little statement there quite well.