"World war one "

World War I (1914–1918) was a global conflict primarily between the Allies (France, UK, Russia, later the US) and the Central Powers (Germany, Austria-Hungary, Ottoman Empire). It was sparked by the assassination of Archduke Franz Ferdinand of Austria-Hungary. Key causes included nationalism, militarism, imperialism, and complex alliances. The war was marked by trench warfare, massive casualties, and widespread destruction. It ended with the signing of the Treaty of Versailles in 1919, which reshaped Europe's political landscape and set the stage for World War II.