Subcategories - Wars, Battles
- 6.6 Million Women Enter the U.S. Labor Force
- A. P. Hill
- Abenaki Wars
- Abraham Lincoln
- Abu Klea
- Adolf Hitler
- Afghan Peace Pact Fails to End Bloodshed
- Afonso I
- Alamo
- Alan Mathison Turing
- Albanian-Turkish Wars
- Albert Kesselring
- Albert Sidney Johnston
- Albigensian Crusade
- Alboin
- Alcibiades
- Aleksandr Kolchak
- Aleksandr Vasilyevich Suvorov
- Aleksei Brusilov
- Alexander H. Stephens
- Alexander I
- Alexander M. Haig
- Alexander Nevsky
- Alexander of Tunis
- Alexander’s Wars of Conquest
- Alfred Jodl
- Alfred von Tirpitz
- Algeria and Egypt Crack Down on Islamic Militants
- Allied Intervention in Russia
- Allied Invasion of France
- Allied Invasion of Italy
- Ambrose E. Burnside
- American Civil War
- American Indian wars
- American Northwest Indian Wars
- American Revolution
- Amin Regime Terrorizes Uganda
- Ancient Warfare
- Andoche Junot
- André Masséna
- Andrew Jackson
- Andrew Johnson
- Anglo-Dutch Wars
- Anglo-French Wars
- Anglo-Irish War
- Anglo-Scottish Wars of 1290-1388
- Anglo-Scottish Wars of 1513-1560
- Anglo-Spanish War
- Angolan Civil War, 1975-2000
- Angolan War of Independence
