For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.
When the US was founded it excluded about 94% of the people from within its borders from participating. Slavery existed on a mass scale throughout the world's early, liberal (so-called) democracies, or often their economy was subsidized by slave labor abroad in their colonies. So if slavery didn't exist within their immediate borders, it existed for the people their political & economic system subjugated. The idea that industrialization or "democracy" (not even sure how you are defining it, really) came into existence suddenly isn't accurate, although there are revolutionary periods where social change came suddenly or breakthroughs in technology that occurred that reshaped social production. Those didn't ever occur in a vacuum, and those discoveries were only able to affect the social system in so far as the social system was developed in such a way that they could be utilized.. Often those big revolutionary changes in the social system were due to contradictions (compounding antagonistic relationships) within the social system itself becoming untenable. Trying to shoe-horn a somewhat obscure military "law" isn't really going to explain how those changes occurred in a realistic way, because human society is much more complicated than that. You seem to want to reinvent the wheel here, you should try reading Marx, you might find it quite satisfying.
On your last point, the French Revolution was crushed ultimately, although the new social order retained changes that were beneficial to its new ruling class. But weapons themselves aren't necessarily going to singularly shape the way in which social conflict resolves. Military technology is important to these developments, but ultimately a part of the larger social system that is always changing to either maintain itself or undergoing revolutionary change.
Yup. And by today's definition, I don't think that's a democracy.
I'd define it as one end of a continuum of incentives for leadership. In a modern democracy, pissing off the voting public is a guaranteed lose condition. In North Korea all that matters is keeping the the people just below you loyal and the people just above you happy (yes, I see your domain, no, I don't want to hear your conspiracy theories right now, I'm having another conversation). Kim Jong Un doesn't need to care if his people are starving as long as his generals keep their soldiers in check for him, who will in turn keep the civilians in check. Maybe he does, I think some dictators do, but he doesn't have to.
Agreed, it didn't happen suddenly at all. It took centuries of both reform and revolution and counter-revolution. But, it did happen unexpectedly after a lot of the same, and I fear it going away again if I don't know why it's here.
Also, I'm not sure if industrialisation is connected to the growth of ideologies, although I suspect it based on timing and certain shared ideas.
Agreed. That's the only variable I can find from the last 2 centuries that didn't exist anywhere in the preceding 50 centuries or so, though, at least to date. My next best guess is that the awareness of progress itself fueled it.