Warm climate favors the development of life. In a single Brazilian tree, you will find more insect species than you can have in all of Europe. In warm climate, resources are plentiful and thus life is easy. Cold climate is related to less life essential resources. It's simply harder to survive there. Cold climate, therefore, favors the development of intelligence and other skills. You'll need to learn how to use tools, the envorinment and, more importantly, your mind, to survive. So now we have a tropical area where there is no natural selection for smarter individuals. In the colder areas, there's natural selection for smarter individuals. Smarter people, more developed societies. Dumber people, less developed socities. That's how Europe and North Asia got more developed than Africa and South Asia by hundreds of years in difference in the first steps of civilization. This, however, does not explain anything past anything circa 2000 or maybe 1000 before Christ. After that, it's just consequence of that initial natural selection for human genes. Also it doesn't explain how the southern cone and south africa are just that better than the rest of africa and south america. Australia is also an exception. That's because of colonization.
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