WWII history

World War II (1939-1945) was a global conflict involving most of the world's nations, including major powers divided into two opposing military alliances: the Allies (led by the United States, Soviet Union, and United Kingdom) and the Axis (led by Germany, Italy, and Japan). Sparked by the invasion of Poland by Nazi Germany, the war expanded across Europe, Asia, and Africa, resulting in significant events like the Holocaust and the use of atomic bombs on Hiroshima and Nagasaki. The war ended with the unconditional surrender of Axis powers, reshaping international relations and leading to the establishment of the United Nations.