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1900s
September 7, 1901 - Boxer Rebellion ends in China
May 31, 1902 - Second Boer War: Fighting ends with the Treaty of Vereeniging
February 8, 1904 - Russo-Japanese War: Fighting begins when the Japanese attack the Russian fleet at Port Arthur
January 2, 1905 - Russo-Japanese War: Port Arthur Surrenders
September 5, 1905 - Russo-Japanese War: The Treaty of Portsmouth ends the conflict
1910s
April 21-November 23, 1914 - Mexican Revolution: American forces land and occupy Vera Cruz
July 28, 1914 - World War I: The conflict begins when Austria-Hungary declares war on Serbia
August 28, 1914 - World War I: The Royal Navy wins the Battle of Heligoland Bight.
November 1, 1914 - World War I: The German navy wins the Battle of Coronel.
December 25, 1914 - World War I: The Christmas Truce begins along parts of the Western Front
December 23, 1916 - World War I: British Commonwealth forces win the Battle of Magdhaba in the Sinai Desert
March 9, 1916 - Mexican Revolution: The forces of Pancho Villa raid across the border and burn Columbus, NM
October 31-November 7, 1917 - World War I: General Sir Edmund Allenby wins the Third Battle of Gaza
April 6, 1917 - World War I: The United States enters the war
June 7, 1917 - World War I: General John J. Pershing arrives in England to take command of US forces in Europe
November 7, 1917 - Russian Revolution: The Bolsheviks overthrow the Provisional Government, beginning the Russian Civil War
June 1-28, 1918 - World War I: US Marines win the Battle of Belleau Wood
November 11, 1918 - World War I: An armistice is concluded ending World War I in a victory for the Allies.
June 28, 1919 - World War I: The Treaty of Versailles officially ends the war.
1920s
June 1923 - Russian Civil War: Fighting ends with the Red capture of Vladivostok and the collapse of the Provisional Priamur Government
April 12, 1927 - Chinese Civil War: Fighting begins between the Kuomintang and Chinese Communist Party
1930s
October 1934 - Chinese Civil War: The Long March retreat begins with Chinese Communists marching approx. 8,000 miles over 370 days
October 3, 1935 - Second Italo-Abyssinian War: The conflict begins when Italian troops invade Ethiopia
May 7, 1936 - Second Italo-Abyssinian War: Fighting ends with the capture of Addis Ababa and the Italian annexation of the country
July 17, 1936 - Spanish Civil War: The conflict begins following an attempted coup d'état by Nationalist forces
April 26, 1937 - Spanish Civil War: The Condor Legion bombs Guernica
September 6-22, 1937 - Spanish Civil War: Republican forces are defeated at the Battle of El Mazuco
April 1, 1939 - Spanish Civil War: Nationalist forces crush the final Republican resistance ending the war.
September 1, 1939 - World War II: Nazi Germany invades Poland beginning World War II
November 30, 1939 - Winter War: Fighting between the Soviet Union and Finland begins when Russian troops cross the border following the faked shelling of Mainila
December 13, 1939 - World War II: British and German naval forces fight the Battle of the River Plate
1940s
March 12, 1940 - Winter War: The Moscow Peace Treaty ends the war in the Soviet's favor
June 22, 1940 - World War II: After a six-week campaign, Germany defeats France and forces the British to evacuate from Dunkirk
November 11/12, 1940 - World War II: In a daring nighttime raid, British aircraft strike the Italian fleet at the Battle of Taranto
December 8, 1940 - World War II: British forces in Egypt launch Operation Compass which sweeps across the desert driving the Italians deep into Libya
March 27-29, 1941 - World War II: British naval forces defeat the Italians at the Battle of Cape Matapan
May 27, 1941 - World War II: Following aerial attacks from HMS Ark Royal and fire from British battleships, the German battleship Bismarck is sunk in the North Atlantic
June 22, 1941 - World War II: German forces invade the Soviet Union opening the Eastern Front
December 7, 1941 - World War II: Japanese aircraft attack the US Pacific Fleet at Pearl Harbor bringing the United States into the war
December 8-23, 1941 - World War II: Japan wins the Battle of Wake Island
February 27, 1942 - World War II: The Allies are defeated at the Battle of the Java Sea
April 18, 1942 - World War II: The planes of the Doolittle Raid bomb Japan
May 4-8, 1942 - World War II: US forces turn back the Japanese advance against Port Moresby at the Battle of the Coral Sea. Fought entirely by aircraft, it was first naval battle in which the opposing ships never sighted each other.
June 4-7, 1942 - World War II: The US Pacific Fleet defeats the Japanese at the Battle of Midway, turning the tide in the Pacific
August 7, 1942 - World War II: Allied forces go on the offensive in the Pacific by landing on Guadalcanal
August 19, 192 - World War II: The Dieppe Raid ends in disaster for Allied troops
August 24-25, 1942 - World War II: Allied and Japanese forces fight the Battle of the Eastern Solomons
August 30-September 5, 1942 - World War II: British forces halt Field Marshal Erwin Rommel at the Battle of Alam Halfa
October 10/11, 1942 - World War II: Allied naval units win the Battle of Cape Esperance
October 23-November 4, 1942 - World War II: British forces under General Bernard Montgomery begin the Second Battle of El Alamein
November 8-10, 1942 - World War II: American forces land in North Africa as part of Operation Torch
November 12-15, 1942 - World War II: Allied forces win the Naval Battle of Guadalcanal
November 27, 1942 - World War II: The French fleet is scuttled at Toulon during Operation Lila
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