Sorry to say that, but - "Welcome to the hybrid war era, dear US brothers and sisters".
There are several states/groups in the world openly hating the USA, its allies and the Western civilization as a whole. They are not capable of winning a conventional war - so, guess what would they want to do?
P.S.:
Here, in Ukraine, we had the similar crazy stuff going on in 2013/2014 inspired and heated by the Russian media/finances/weapons/proxies, etc. In the early 2014, it was first just ridiculous to hear their chants about a possibility of a 'civil war' in our country. And now - guess what? We've got 6+ years of a so called 'civil' war (in fact, with Russian army and Russian proxies) with no end to it in sight.