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.

(4) the British navy was busy raiding the carribean for prize money and abandoned the army in america.

I recommend the book "The Men Who Lost America: British Leadership, the American Revolution and the Fate of the Empire"