How did the Native American populations spread to North, Central, and south America?

They now believe that widespread epidemic disease, to which the natives had no prior exposure or resistance, was the primary cause of the massive population decline of the Native Americans. ... One reason this death toll was overlooked is that once introduced, the diseases raced ahead of European immigration in many areas.Explanation:

a small town is a good definition for new france in 1750. new france was the area colonized by france in north america. the area is nowadays the city of quebec in canada.

answer; john b watson,(observable behavior);