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Something I am writing begins with a POD in 602 AD in the Old World, but I am using multiple PODs so that several things change. Ergo I would like a POD in 602 or after (but not too late) that allows

A) The Amerindians to maintain control of most of South and Central America
B) To somehow survive the diseases the Old Worlders eventually bring over and develop a better immune system to handle them
C) The Europeans colonize the eastern of what is OTL the United States and Canada along with the Caribbean
D) Perhaps (they don't have to, up to you) the Chinese or other East Asian powers colonize the west?

In the timeline there are no Islamic conquests, so keep that in mind (what reasons would Europeans have for going across the Atlantic?)

What are the best ways to delay Old World discovery of the Americas, but still have Europeans arrive first.

Finally, is there a way to have non-Scandinavian Europeans arrive on the east coast just before the Chinese arrive in the west?
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