What is World War I?

World War I was a global conflict that began in Europe in 1914 and spread across continents and empires. Its causes involved alliances, nationalism, imperial competition, and crises.

How did the war begin and spread?

The assassination of Austro-Hungarian heir Franz Ferdinand in Sarajevo on 28 June 1914 triggered an existing diplomatic crisis. Decisions during the July Crisis and alliance systems helped turn a local conflict into war among great powers. Militarism, imperial competition, and nationalism were important background factors, but no single cause explains the war. It affected colonial territories, sea routes, and societies in the Middle East, Africa, and Asia as well as Europe. The Ottoman Empire entered on the Central Powers’ side in 1914; Gallipoli, Caucasus, and Middle Eastern fronts caused great losses.

Social consequences and the postwar order

Trench warfare, artillery, machine guns, naval blockades, and chemical weapons increased mass destruction. Civilians faced hunger, forced migration, epidemics, and expanded state control; women’s roles in paid work changed in many countries. The 11 November 1918 armistice halted fighting, while peace treaties and borders came later. The Russian, German, Austro-Hungarian, and Ottoman empires dissolved, producing new states and further conflicts. National memories differed, and colonial soldiers’ experiences and losses were not equally visible. The war should be studied through families, economies, and politics as well as battlefields.