Few thousand years.

Dear, it still happens. "Those who make peaceful revolution impossible will make violent revolution inevitable." is not even a point of discussion but a statement of a fact. Your so called thousands of years is less than a year from revolution in Nepal and around 40 years of fall of USSR in Europe; not to mention the regression is caused by oligarchs who have transformed US into a competitive authoritarianism. They must learn fear before civil war becomes the only remaining option.