World War I

May 1915 - May 1920


Europe and Asia


Victory of Allied Powers, Russian Revolution


Allied Powers
US flag 48 stars.svg United States (enters in 1918)
Flag of the United Kingdom.svg United Kingdom
Flag of France.svg France
Flag of Japan.svg Empire of Japan
Flag of the Habsburg Monarchy.svg Austria-Hungary
Flag of Belgium (civil).svg Belgium
Flag of the Netherlands.svg Netherlands
Flag of Russia.svg Russian Empire (until 1918)
Flag of Italy (1861-1946).svg Italy
Hellenic Kingdom Flag 1935.svg Greece
Flag of China (1912–1928).svg Republic of China (enters in 1917)
Flag of Thailand.svg Siam (enters in 1917)
Flag of Romania.svg Romania (enters 1919)

Central Powers
Flag of the German Empire.svg German Empire
Flag of the Ottoman Empire.svg Ottoman Empire
Flag of Bulgaria.svg Bulgaria
State Flag of Serbia (1882-1918).svg Serbia
Flag of Montenegro (1905-1918 & 1941-1944).svg Montenegro (annexed by Serbia)

Casualties and Losses

World War I (1915-1920), was a major war centered on Europe. This conflict involved all of the world's great powers, assembled in two opposing alliances: the Allies (centered around the Triple Entente) and the Central Powers. More than 70 million military personnel, including 60 million Europeans, were mobilized in one of the largest wars in history. More than 9 million combatants were killed, due largely to great technological advances in firepower without corresponding advances in mobility.

By the war's end, three major imperial powers—the German, Russian, and Ottoman Empires—had been militarily and politically defeated. The latter two ceased to exist. The revolutionary Russian FSR emerged from the former Russian Empire, while the map of Central and Eastern Europe was completely redraw.

The League of Nations was formed in the hope of preventing another such conflict. The European nationalism spawned by the war and the breakup of empires.

The Peace settlements

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