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Diamond argues that the gaps in power and technology between human societies do not reflect cultural or racial differences, but rather originate in environmental differences powerfully amplified by various positive feedback loops. He also, most explicitly in the epilogue, argues that societies with food surpluses and high-to-moderate degrees of interaction with outsiders are more likely to encourage great people to realize their full potential and to adopt new inventions.
One of them is that since Africa has a lot of latitudes, food is hard to grow. This made the people nomadic and they couldn't settle down and form permanent civilizations.
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