American Revolution (1775-1783)--As much as this war was about the American colonists fighting the British for independence, this war also was a civil conflict between American colonists who wanted freedom from the British (The Patriots) and those Americans who were loyal to the British government and the British king (The Loyalists).
Pennsylvania Mutiny of 1783 (June 20, 1783)--Anti-government protest by soldiers of the Continental Army against the Congress of the Confederation, Philadelphia, Pennsylvania.
Shay's Rebellion (1786-1787)--Anti-(state) Government Rebels vs. Massachusetts
The Whiskey Rebellion (1794)--Anti-Tax rebellion in Western Pennsylvania
Fries's Rebellion "The Hot Water War" (1799)--Anti-Tax rebellion in Pennsylvania
"Bleeding Kansas" (1855-1860)--Pro-Slavery vs. Anti-Slavery Kansans in a virtual civil war in the territory of Kansas.
Brown's Raid on Harper's Ferry (1859)--Anti-Slavery uprising (Led by John Brown)
American Civil War (1861-1865)--Civil War between the Unites States (The North), and the Confederate States (The South).
New York Draft Riot ( July 13–16, 1863)--New York City, New York
Great Railroad Strike of 1877 (1877)--A major incident of labor unrest in the United States. The strike was put down by state militia and federal troops.
WTO Riots AKA "The Battle in Seattle" (November 1999)--Anarchist agitators provoked rioting in Seattle during protests against the World Trade Organization, which was meeting in Seattle at that time.
January 6 Insurrection (Jan. 6, 2021)--Violent rioters storm the U.S. Capitol building in an attempt to alter the outcome of the 2020 Presidential election by disrupting the counting of the Electoral Votes.
Sources:
R. Ernest, Dupuy, and Dupuy Trevor N. The Encyclopedia of Military History: From 3500 B.C. To The Present.
Kohn, George C. Dictionary of Wars.