Overview
World War II was a global conflict that lasted from 1939 to 1945, involving most of the world's nations, including the **United States**, **Germany**, **Japan**, and the **Soviet Union**. The war was fought between two main alliances: the Allies and the Axis, with the Allies ultimately emerging victorious. The war resulted in an estimated 50-80 million fatalities, making it the deadliest conflict in human history. The war also led to the formation of the **United Nations** and the emergence of the **United States** and the **Soviet Union** as superpowers.