All of the ideas the founding fathers discussed arose in the Wars of the Three Kingdoms in the 1600s. If you're familiar with that conflict, particularly that between the Parliament of England and Charles I, a lot of the US founding fathers' particular obsessions (the word tyranny, for instance) make more sense. The real magic in the American Revolution was how spectacularly unambitious it was; all of the most important parts were already in place in Britain, and only denied to the colonies through sheer bloody-mindedness.

The US is not the first modern democracy; it's just the best at self-aggrandisement.

> The real magic in the American Revolution was how spectacularly unambitious it was; all of the most important parts were already in place in Britain, and only denied to the colonies through sheer bloody-mindedness.

I think the main 'innovation' was the splitting up of the Crown / Executive.

One failing was not taking political parties into account. It's not like they were unknown at the time:

* https://en.wikipedia.org/wiki/Political_party#18th_century