Whether it's teetering depends on how strong it is, but here are a few of the most unequivocal reasons why we know it's under attack, and that the defenses are weakened:

- A conspiracy to refuse to leave the white house went unpunished at the highest levels of government.

- Congress is refusing to cancel declarations of emergency that grant the executive special powers with enormous impact.

- Habeas corpus has been violated many times and the judicial branch has been limited to ineffectively "ordering" it to stop in one case.

There are many others, but the ones that are overtly political tend to be "invisible" to people who agree deeply enough. For example, Chinese-style social media scanning for visa holders seems to only bother people who do not see the US as being in a state of war related to what their social media is being scanned for.