|World War II (Mondo de Scopatore)|
Clockwise from top left: American partisans during the Japanese invasion of Hawaii, Russian soldiers charging at a German line, an Australian soldier rescuing a Filipino girl during the Philippines campaign, British soldiers during the battle of El Alamein, Japanese soldiers march into Manchuria, Japan signs surrender documents
Union of Socialist States of America
World War II (WW2 or WWII), known also as the Second World War or the Second Great War, was a global war that lasted from 1939 to 1945, though related conflicts began earlier. It involved the vast majority of the word's nations—including all of the Great Powers—eventually forming two opposing military alliances; the Allies and Axis.