Nuclear war isn't what's going to bring down this country. Nor a trade war. Possibly a pandemic. More likely, though, it will be some sort of civil war and we're in short supply of Abe Lincolns these days. I never thought I'd say that in my lifetime, but given what the internet allows us to do, I could see it happening. Things that would have taken laborious efforts to coordinate in the past can now happen with a snap of the fingers and you can manipulate people far easier and reach far more people.