World War II

World War II (1939–1945) was a global conflict involving the Allied Powers, including the United States, Soviet Union, and United Kingdom, against the Axis Powers, primarily Germany, Japan, and Italy. Triggered by Germany’s invasion of Poland, the war rapidly escalated, engulfing Europe, Asia, and beyond. Key events included the Holocaust, the Battle of Stalingrad, D-Day, and the atomic bombings of Hiroshima and Nagasaki. Fought across multiple theaters, it involved unprecedented military and civilian mobilization. The war ended with the Axis defeat, reshaping global politics, establishing the United Nations, and ushering in the Cold War era.