however recently clovis mans DNA was discovered in central/south american peoples. Clovis culture seems to have had a much wider range then just NA.
DNA from mammoths/horses dated at about 6k years ago has been found in permafrosts in central Alaska, and fossils/ frozen remains on western coastal NA islands, and along the land bridge from Alaska to Russia. So although that blast was HUGE it didn't totally wipe out animals that migrated with the seasons or 'clovis man'
really must have been quite an event, I read the impact caused wildfires coast to coast! and are what formed a lot of the east coast bays & islands.
edited to add this good read https://en.wikipedia.org/wiki/Younger_Dryas_impact_hypothesis
and here's the actual report from the scientists in the field 
http://advances.sciencemag.org/content/4/11/eaar8173
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