What treaty ended world war 2

The Treaty of San Francisco

Explanation:

Although the war ended in 1945, it technically "officially" ended at the passing of the Treaty of San Francisco in 1952 when the Allies made a peace treaty with Japan. This was a formal ending to the war.

Peace treaty

Although Sept. 2, 1945, is known as the end of World War II, the state of war formally ended when the treaty of San Francisco came into force on April 20, 1952. It was a peace treaty with Japan.