What happen during the years 1914 and 1939?

Between 1914 and 1939, two significant global events occurred: World War I and the lead-up to World War II. World War I began in 1914 and lasted until 1918, resulting in massive loss of life and significant geopolitical changes. The interwar period saw economic turmoil, including the Great Depression, and the rise of totalitarian regimes in several countries. By 1939, tensions in Europe had escalated, leading to the outbreak of World War II.