The scenario presented is a good bit too stark for a number of reasons. I do not think the kind of "lights go out" catastrophe lasts long in much of the US for a number of reasons:
1. The bad guys won't be supported as well as the good guys. While the bad guys in Iraq and Afghanistan would go out and shoot at or bomb our troops for a few hundred dollars, people here won't be that dumb for that little. Even if our enemies try to subsidize our destruction, going against a bunch of folks with natural gas wells is just a waste of money. The folks with gas wells want to sell product, and wastelands don't buy many therms,
2. Despite the best efforts of a lot of evil, small minded folks, the US is not the Middle East and doesn't suffer from those cultural limitations. I've worked in Iraqi Kurdistan amongst the people. The Kurds had some limitations, but were confident and capable of getting things done. The cultural limitations of the Arab mind were profound by comparison, and are far worse than all but the worst of university faculty lounges here. The kinds of stupid that keep the Middle East hell aren't native here and those roots are not deep.
3. Experiences in Germany and Japan show that very large portions of a population can die without civilization crumbling. The denizens of the university faculty lounges, housing projects, and other artificially sustained pockets of idiocy are going to take a serious hit, but those who choose to get un-stuck from stupid will aggregate civil society faster than you think.
4. Nobody has the logistical ability to mount a serious campaign on US soil. The Chinese could theoretically deliver the troops, but doing so would lay their country bare to revolution. Also, the Chinese haven't mounted a meaningful campaign in living memory with any success. Putting this into perspective, in the last two months US citizens have bought enough firearms to arm both the Chinese and Indian military's. Mexican cartels might be able to hold some dirt for a while, but their doing so will result in their extinction.
5. Absent complicity with idiocy or organized military occupation, the lights don't stay off very long in the US. Currently we are are being complicit with a survivable amount of idiocy, but not a sustainable amount of political idiocy. Also, that idiocy is not native to our culture and is becoming more transparently idiotic.
I still strongly support prepper efforts and keep a lot of material ready for emergency, but most of the land area of the US will return to functioning fairly quickly. The kinds of combat described in the video will likely occur, but not for very long and not in many places. I have high hopes that the death toll will be well under fifty million, and almost exclusively centered on the stupidest states in the union. Damned shame about all the museums, though.