World War II: A Global Conflict

World War II, occurring from 1939 to 1945, was a global conflict that involved most of the world's nations, divided into two opposing military alliances: the Allies and the Axis powers. The war was initiated by Germany's invasion of Poland and saw widespread combat across Europe, the Pacific, and North Africa. Key events included the Holocaust, the Battle of Britain, and the dropping of atomic bombs on Hiroshima and Nagasaki. The war concluded with the unconditional surrender of Germany in May 1945 and Japan in September 1945, leading to significant political and social changes worldwide, including the formation of the United Nations and the onset of the Cold War.