What did the countries involve during World War 1?

World War I involved two major alliances: the Allies and the Central Powers. The Allies primarily included France, the United Kingdom, Russia, Italy, and later the United States, while the Central Powers consisted of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria. The conflict began in 1914 and was sparked by the assassination of Archduke Franz Ferdinand, leading to widespread mobilization and a devastating global war that lasted until 1918. The war resulted in significant political, social, and economic changes across the involved nations.