World War II which lasted from 1939 to 1945, was a global conflict involving nearly every nation in the world.
Between 1939 and 1945, all of the world's major powers were involved in World War II. Millions of people were killed in the most destructive war in history. It was fought between the Allies and the Axis (Germany, Japan, and Italy) (Britain, the US, and the Soviet Union among others).
Roosevelt, who publicly declared the conflict the "Second World War" in 1941, and his fellow Americans quickly followed suit. (Until the late 1940s, it was simply referred to as "the War" in the United Kingdom.)
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