alternatehistory.com

An Interesting article http://http://www.boston.com/news/science/articles/2008/03/03/a_long_trek_for_ancient_mini_monkeys/ that I just read seems to support the theory that some monkey's may have actually been able to travel to the Americas through a land bridge? But what If instead of going extinct, these primates evolved into fully sentient Homininds? What was a determining factor in keeping OTL South American Monkey's from travelling north and adapting to the prarie/savanah lands in North America? Any other possibilites on the ALT zoology tl?
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