I read somewhere that the average American woman averaged 13 children in her lifetime, versus 6-8 in Europe. Hence the life expectancy was about the same but the population growth rate was phenomenal. And the English government did not like expansion outside it's control, and said "don't go beyond this line". Population pressure drove people into the Appalachians, and some beyond to Ohio valley and Tennessee. This may have been another factor in the Revolution that wasn't fully discussed - the Americans had to expand or die, merely from demographics, and to live as densely as the mother country was not the only option.
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