It's absurd because we have prohibitive military might. You cannot pose an existential threat to our government. There has never been a civil war in a nuclear-armed country, and we're not just any nuclear country. We're 20 years ahead of China's military technology, which means we're 40 years ahead of whatever non-governmental resistance you're conceiving of. Your gun wouldn't mean shit.
It wouldn't be a "war". Theoretically, it would be pockets of militants being put down. In reality, it would never come to that because you'd have to be insane to enter an armed conflict with a goal of overthrowing the US government, and there simply aren't enough insane people.
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