World War I started in:

🧠 Explanation:

World War I began in 1914, triggered by the assassination of Archduke Franz Ferdinand. Fought until 1918, it involved global powers, reshaping geopolitics. The conflict introduced trench warfare, causing millions of deaths and widespread destruction. It led to the collapse of empires and redrew national borders, influencing modern history. The war’s economic and social impacts were profound, sparking revolutions and treaties like Versailles. Its legacy includes lessons on diplomacy and conflict prevention, with 1914 marking the start of a transformative era that continues to shape international relations and global stability.