The Centre for Strategic and International Studies has defined a civil war as a conflict in which at least 1,000 people are killed.
The institution drew a comparison to the 1791 Whiskey Rebellion, which erupted due to excessive taxation. Based on this definition and historical context, the Centre believes that the United States is on the brink of another civil war.
https://www.armstrongeconomics.com/armstrongeconomics101/ecm-armstrongeconomics101/europe-fears-a-us-civil-war-whiskey-rebellion-to-now/