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Asked before:
https://www.reddit.com/r/AskHistorians/comments/w7u5r/howwhy_were_early_europeans_so_much_more_advanced/
https://www.reddit.com/r/AskHistorians/comments/2000lw/why_didnt_native_american_and_african/
https://www.reddit.com/r/AskHistorians/comments/2ufc6b/why_were_the_european_countries_so/
https://www.reddit.com/r/AskHistorians/comments/2ceb6g/europes_advanced_technology_over_africa_native/
https://www.reddit.com/r/AskHistorians/comments/47zo49/why_werent_civilizations_in_the_ancient_north/
https://www.reddit.com/r/AskHistorians/comments/4s49b4/why_were_native_american_civilizations_so_far/