when was ww1

World War I, also known as the First World War or the Great War, began on July 28, 1914, and ended on November 11, 1918. The war started after Austria- Hungary declared war on Serbia following the assassination of Archduke Franz Ferdinand on June 28, 1914. The conflict involved two major coalitions: the Allies (including countries like France, the United Kingdom, Russia, and later the United States) and the Central Powers (mainly Germany, Austria-Hungary, and the Ottoman Empire). The war is noted for its deadly battles and significant geopolitical consequences.