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Historians do not have a general consensus on the exact starting point of World War II. The first formal declarations of war among the major powers involved were in 1937, when Japan and China went to war, and in 1939, when Germany invaded Poland.


The major combatants in World War I were the Central Powers of Germany, Austria-Hungary, Bulgaria and the Ottoman Empire versus the Allied Forces of Great Britain, France, the United States, Russia, Italy and Japan. In addition, nearly 20 other countries and several col...


The trigger for World War I was the June 28, 1914 assassination of Archduke Franz Ferdinand of Hungary by the anarchist Serbian Gavrilo Princip in Austria. However, the true cause of the war was a combination of romantic nationalism and a network of alliances that, whil...


Although the assassination of Austrian Archduke Franz Ferdinand is cited as the main cause that thrust the world into war, many causes and events led up to World War I. Some of the secondary causes include the mutual defense alliances in place at the time, nationalism, ...


World War II lasted from 1939 to 1945, which is more than seven years. This war resulted in close to 50 million deaths, making it the bloodiest conflict in world history. The two main groups fighting were the Axis powers and the Allies.


World War I was a disastrous European war fought from 1914 to 1919 that also entangled many non-European areas, including colonial empires and the United States. The major powers included Britain, France and Russia on one side, and Germany, Austria-Hungary and Turkey on...


Though the conflicts began much earlier, World War II did not officially begin until September 1, 1939. The massive war ended 6 years later in 1945.