Sorry, but most scholars on the subject agree? What scholars? Since when?
So according to this theory, the European colonials just up and forgot centuries of cultural and political heritage, English common law, Magna Carta (and yes, Rome had a Senate and in theory at least, a republican form of gov't and Greece was the birthplace of democracy), etc and had no influences whatsoever from the European philosophers and writers of the past and of their time? Amazingly, they were suddenly struck with a tabula rasa, severed from their European heritage and contemporaneous culture, and could only look to the Native Americans for a model of governance?
Might as well say the Native Americans were themselves influenced by the democracies of the ancient Greek city states.