The American and French revolutions originated in the middle classes. The poor are often indifferent to politics because they're focused on survival. The middle classes, who own things they don't want to lose and have free time to aspire for more, are the ones who start revolutions. The poor only came in after being whipped up by the interested parties, and don't necessarily join the revolutionary side.

Three critical differences the American Revolution had: (1) the middle class had some extremely well educated people, (2) the communication technology among the colonies was pretty fast whereas the comms between the colonies and the British rule across the Atlantic was slow, and (3) the empire tried to clamp down on the colonies ability to export to any market other than the mother country, killing lots of profit which previously made those markets strong.