Date: 2011-11-02 04:10 am (UTC)
From: [identity profile] roseembolism.livejournal.com
One aspect according to Jared Diamond is that Eurasia is largely East-West oriented, while the Americas are North-South. That means that Asian diseases had a pretty-much straight run west, without radical changes in climate zones, unlike the Americas. Therefore diseases in the Americas were far more geographically limited.
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