Trying to remember the title of a book

I'm wondering if anybody can help me rember the title of an alternate history Book I read a long time ago.

I believe the cold war went hot, and it was fought with bioweapons. A plague wiped out most of the Caucasian people in the Americas, and the continent was re-taken by the Native Americans.

Has anybody read this book? Can you tell me what it was called?
 
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