The first World War began in the year 1914, specifically on July 28, when Austria-Hungary declared war on Serbia, following the assassination of Archduke Franz Ferdinand. This conflict quickly escalated as alliances were activated, involving many countries across Europe and beyond. It was characterized by trench warfare, new military technologies, and extensive loss of life. The war lasted until November 11, 1918, ending with an armistice that led to significant geopolitical changes and the establishment of the Treaty of Versailles in 1919. The impacts of World War I were profound, influencing future conflicts and shaping modern history.