Well, you run into the trouble of “help with what”

We do still have plenty of treaties, and the allies that go with them. So long as we don’t break those treaties, those allies are likely to provide the kind of help they cover.

If you mean “help us get rid of the fascists”, nobody yet because the fascists haven’t been stupid enough to try and export it in ways that violate treaties, so it’s an internal matter.

Even if the US devolves into civil war, don’t expect to see external military assistance being provided to any sides involved until and unless there’s no other choice.

However, there’s a good chance that US refugees would be welcomed to some degree in most of our allied nations. If refugees could get there. Canada would only take so many, and would otherwise have to play adoption agency, which they might not be willing to do. Same with Mexico. You might see some people fleeing via water, but where would they go that would either accept them or help them to other nations that would?

So, we aren’t without help. It just might not be the kind of help you want.

With all of that in mind, chances are high that at least some of our allies would try to get assistance into the country to back whatever factions they support. Dunno if that’s help or not, but it is what it is.