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World War I
World War I began in 1914, after the assassination of Archduke Franz Ferdinand, and lasted until 1918. During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States (the Allied Powers). -
Russian Revolution
The Russian revolution took place in 1917 after the poor in Russia wanted a new government. After winning the revolution the new communist government was called the Soviet Union. -
Pearl Harbour
The attack on Pearl Harbour happened on December the 7th 1941. The attack killed many soldiers and destroyed many ships, pushing the US to join the War against Japan.