With due respects to Victor Hanson, the concept of civil war doesn't work any more. Lincoln's war cemented the issue of federalism over states rights. An estimated account of about 700,000 to a million of Americans died because Lincoln had bad advice regarding the severity and result of an armed rebellion. It can't happen today because the issue has been settled on the blood of Americans over 150 years ago.
The modern version would play differently than that from @160+ years ago. More like an insurrection form of guerilla warfare. Some think it already started, years ago, at a low level of skirmish.
From the book "Unmasked ..." by Andy Ngo;
...
CHAPTER 4
Rose City Antifa
BETWEEN 2017 AND 2019, there were around two and a half dozen
violent protests and riots involving antifa in Portland. Before 2020, that was
considered a lot. Most of the incidents were organized or co-organized by
Rose City Antifa (RCA), the oldest antifa group in the United States. It
takes its name from the “City of Roses,” a nickname for Portland.
Antifa began accelerating their mass organizing in early 2017 as Donald
Trump took office. Within a couple months, they had developed a
sophisticated system that included propaganda, outreach, operation security,
reconnaissance, and group fighting strategies. Despite the mantra claiming
there is “no organization” to antifa, I could see their operations clearly took
planning, coordination, money, and recruitment. From one riot to the next,
their numbers grew and they became better at carrying out carnage on
people and property. Still, without being inside RCA myself or speaking to
someone who was, and they never willingly speak, the inner workings of
the organization remained speculation. Then, in June 2020, the public
finally received a rare glimpse into the workings of the group through a
video release by Project Veritas, the independent investigative journalism
site founded by James O’Keefe.
After being conditionally approved to join RCA on a probationary status,
a journalist at Project Veritas who used the moniker “Lion” was sent the
following welcome email on September 22, 2017, after spending time in
Portland and befriending antifa. The email detailed the six-month vetting
process that includes an intense radicalization process and training
curriculum. Only upon completion of the program and the unanimous
consent of members can one officially be welcomed in the organization.
...
https://www.wecima.uk/storage/book_files/YTEM9V2CWF.pdf 
victorhanson.com
