Subcategories - Civil Wars, Coups
- Somoza Is Forced Out of Power in Nicaragua
- Spanish Civil War
- Spanish Civil War Begins
- Sri Lankan Civil War
- Stonewall Jackson
- Sudanese Civil War
- Sudanese Civil War Erupts
- Taliban Begins Wholesale Suppression of Human Rights in Afghanistan
- Tamil Separatist Violence Erupts in Sri Lanka
- Thaddeus Stevens
- Third Baron Fairfax
- Thirty Tyrants Rule Athens for Eight Months
- Thomas Wentworth Higginson
- Three Kingdoms Period Begins in China
- U.S.S.R. Toppled, Paving the Way for Reforms in Former Soviet Republics
- Ukrainian Nationalists Struggle for Independence
- Ulysses S. Grant
- The United Fruit Company Instigates a Coup in Guatemala
- The United Nations Intervenes in the Congolese Civil War
- A United Nations Peace Force Is Deployed in Cyprus
- United States Invades Cambodia
- Venezuelan Civil Wars
- Vietnamese Civil War
- Vietnamese Troops Withdraw from Cambodia
- War in Somalia from 1987 to 1995
- War of a Thousand Days
- Warring States Period
- William S. Rosecrans
- William Tecumseh Sherman
- Winfield S. Hancock
- Winfield Scott
- Year of the Four Emperors
- Yemenite Civil War
- The Young Turk Movement Stages a Constitutional Coup in Turkey
- Yugoslav Federation Dissolves
- Yugoslavian Civil Wars, 1990-1999
- Zaire President Sese Seko Flees Capital as Rebels Take Over
- Zia Establishes Martial Law in Pakistan
