• American Civil War
  
  Circa 1861-1865.
  http://www.re-quest.net/history/war/civil/
• American Revolutionary War
  
  Circa 1775-1783.
  http://www.re-quest.net/history/war/revolutionary/
• Spanish-American War
  
  Circa 1898.
  http://www.re-quest.net/history/war/spanish-american/
• World War I
  
  Circa 1914-1918.
  http://www.re-quest.net/history/war/world-war-i/
• World War II
  
  Circa 1939-1945.
  http://www.re-quest.net/history/war/world-war-ii/

     See also, these cross-references:

• Encyclopedias