Fascinating and likely important article in The Guardian on an academic group that ran simulation exercises (wargaming) in 2024 on the possibilities of a new US civil war. The results may be prophetic.

We ran high-level US civil war simulations. Minnesota is exactly how they start | Claire Finkelstein
Developments in Minnesota closely mirror a scenario explored in a 2024 exercise conducted at the Center for Ethics and the Rule of Law at the University of Pennsylvania, which I direct