As I understand the American Founders, the most brilliant and daring idea they had was that it’s possible to create a free society that could stay free forever.
The founders were not merely revolutionary. They were rooted. They knew their classics, and they knew from writers such as Cicero and especially Polybius that no system ever lasted, and free systems are especially precarious because freedom is the greatest enemy of freedom. So they devised a system that would have antidotes built into it. I think their system was positively brilliant, and yet the present generation either totally ignores it or pretends that it has something better. I think modern American freedom is unsustainable.