I think you're really wrong. I actually agree with
@fatguyinalittlecoat.
I'd recommend the book I'm reading to just about anybody -
Divided We Fall: America's Secession Threat and How to Restore Our Nation by David French. It's an easy read but really says a lot. I recommend it highly.
We have always been a nation of divided interests. But it's only been recently that we've taken it to such a deep personal level. He talks about how there were deep, religious differences that needed overcoming upon the formation of the USA. What we argue about is different today, but the depth of conviction isn't much different.
I'd argue that it's because we've made the federal government so important - where we make "one size fits all" laws that apply where they don't have any business to.
One example that French cites is the idea of sanctuary cities. That should be California's business. But since California wants to make it everybody's business, then people push back on it nationally and they ask - at this iteration - for the Trump administration to get involved. Don't go down this path too specifically. It's just an example.
I think if we returned to more of a federalist form of government where you live like you live and I'll live like I live that a lot of pressure would be relieved.