World War I, also known as The First World War, The Great War and "The War To End All Wars," was a global military conflict which took place primarily in Europe between 1914 and 1918. More than nine million soldiers and civilians died. The conflict had a decisive impact on the history of the 20th century. The Entente Powers, led by France, Russia, the United Kingdom, and later Italy (from 1915) and the United States (from 1917), defeated the Central Powers, led by the Austro-Hungarian, German, Bulgarian and Ottoman Empires. Russia withdrew from the war after the revolution in 1917.