==Scholarly consensus== 

 With in the section, this is posted: 

 "Genetic and immunological studies over the past two decades have failed to yield evidence of precolumbian African contributions to populations in the Americas.[5][6][7]  The high mortality associated with the spread of Old World diseases introduced by Europeans suggests long-term immunological isolation" 

 1) Does this source deal directly with the controversy? 
 2) Does this even contradict claims of pre-columbian "contact" (it's ludacris to suggest that it does as if such proposed small contacts would affect the entire native american gene pool) 

 ^Assuming that neither apply, why is this not original research, even desperate to some extent?