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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).
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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.
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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.