Red Dawn (1984, United Artists, dir. John Milius, story by Kevin Reynolds, 114 min, PG-13) proposes the nightmare Cold War scenario: an all out conventional Soviet invasion of the United States. Here it starts with paratroopers landing outside a Colorado high school, within sight of The Kids, who become the warriors to take back the country. The treatment comes across as less than compelling; the invaders apparently assembled in Nicaragua and moved north.
Stories of civilian rapes as they crossed the (AZ, NM, or TX) border are told second hand. The commies do control the town with martial law. My own imagination during that time envisioned Commies smuggled into the country with tiny dirty bombs to launch in cities. Trouble is, the modern threat of asymmetric terrorism really does suggest treatments of how American society could come apart, and they are much scarier than this movie is.
If this scenario were to really happen, many towns might be taken, and one cadre of teens could not retake them all. Where is the Army? Where are the fibbies? There is a problem with political apocalyptic fiction that real events in time will outpace them and make the whole scenario obsolete. I have the same problem with my own 'Angel's Brother' manuscript.
There is a 2012 remake by Dan Bradkey, where North Korea invades the Pacific Northwest. Actually, much more likely would be a DPRK ICBM or possibly an EMP blast. This started to become a threat around 2017 in the early days of the Trump administration.
end