What cultural similarities did native peoples of the Western Hemisphere share in the 1490s?

On the eve of European colonization in the 1490s, Native Americans lived throughout North and South America, but their total population is uncertain. Some experts claim that Native Americans inhabiting what are now the United States and Canada numbered 18 million to 20 million, while others place the population at no more than 1 million. A prudent estimate is about 4 million, or about the same as the number of people living on the small island nation of England at that time. The vastness of the territory meant that the overall population density of North America was low, just 60 people per 100 square miles, compared to more than 8,000 in England. Native Americans were spread thin across the land because of their survival strategies of hunting, gathering, and agriculture, but regional populations varied (Figure 1.1).[[LP Figure: F01.01 Native American Population in North America about 1492 (Estimated)/ROA_704115_01_F01.jpeg]]

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Figure 1.3: FIGURE 1.1 Native American Population in North America about 1492 (Estimated)
Figure 1.3: Just before Europeans arrived, Native American population density varied widely, depending in large part on the availability of natural resources. The Pacific coast, with its rich marine resources, had the highest concentration of people. Overall, the population density of North America was less than 1 percent that of England, which helps explain why Europeans viewed North America as a relatively empty wilderness.