> Looking at the US from outside, I am starting to wonder how close they are to a societal collapse.

The US is not particularly close (at least, not highly probable) to a societal collapse; that's, in a sense, an overly optimistic position. Government, order, and structured society are not in imminent danger of collapse.

It is very close to a transition away from liberal democratic government in favor of something very different. [0]

[0] Arguably, past that point, but close to the point where it becomes widely accepted that the it wasn't a temporary aberration where the basic cultural and institutional supports were still intact and capable of snapping things back.