Well, in general terms, the American Revolution came about because the British government did not fully realize the seriousness of the unrest and dissatisfaction which soon developed in its colonies...
They were all started by rebels looking to overthrow the tyranny of their current government. Side note: Almost all countries were formed by anarchists and rebels.
I'm assuming you mean how all three are different.The America revolution was to break away from the Mother Country.The French revolution was to force the monarchy out of power so they could have a...