@Desert Fox
Kid, it is really embarrassing reading your posts as you are completely clueless.
You compare the reconstruction of an already industrialised homogeneous society like Japan with that of multi-ethnic African states?
LOL. Japan already had an industrialised society which it was able to rebuild by becoming a US puppet after WW2. US provided both the money and the market to allow the educated Japanese to rebuild their society. Since you seem to be a WW2 fan, just look and see how Japan was able to produce weapons that were the equal of other industrial powers during WW2 and so they started from a high base already.
Why have the African countries done so badly since independence?
Main reasons are thier lack of homogeneity and the complete lack of industrial and educational base to start off from. As an example of what a black country is able to do, we need only look at Botswana that has been independent since 1966 and has an 80% Tsawana ethnic majority. It is a well run middle-income county growing nicely.
Let us look at S Asia to illustrate how lack of ethnic homogeneity can screw up development. Both Pakistan and India have been independent since 1947 and are still 3rd world. At least BD has the excuse that it had to start from scratch in 1971 and that is the reason why it is no better than either Pakistan or India. Sri Lanka would be even wealthier now if it was not for the India supported 25 year civil war created by India on it.
You sound like a really young and naive kid. I suggest rather than looking for "evidence" to support your pre-conceived notions, you read more widely and maybe travel a bit so that you have enough information in order to form credible opinions that people will take seriously.