We spent so much time worrying about foreign adversaries. But if a collapse were to come, it won’t be because we are invaded by a foreign power, it would be because half of the people can’t stand the other half.
The US government has a report on how the current US government was put in power by a foreign adversary, who is also heavily invested in polarizing US society as part of their strategy.
You can't ignore the decade long psyop by Russia to destabilize democracies in the West, which the result is exactly that you can't stand each other anymore.
A little over 1/3 didn't vote at all.
A motived pushed back from virtually any part of the electorate -- they have the 2nd Amendment for a reason guys -- or a small push from established military officers could easily topple Trump.
Arguably the real risk is social media, since they're all in bed together now, and have a stated aim of owning the system. If you're gonna topple trump, you'd better have a go at the zuck, theil, and larry ellison, etc