There's a fourth, and probably the most important one: there was a period of near-self-government that grew up among the colonies while England was convulsed by civil wars and succession crises; which must be coupled with the formation of the various colonies founded on principles of religious dissent.
Moreover, there were numerous attempts to establish representative governments within the Colonies -- the House of Burgesses in Virginia being probably the most notable example.
"There's a fourth, and probably the most important one: there was a period of near-self-government..."
I can see that giving them a taste for more.