Need help with History 114 and four culture zones established in Afro-eurasia

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Need help with History 114 and four culture zones established in Afro-eurasia

Q. What four culture zones were established in Afro-eurasia by 500 CE? How did these culture zones influence their surrounding regions? Why was Eastern Eurasia considered to be mor economically powerful, politically united and geographically expansive than Western Eurasia? Why did this begin to change by 1500 CE