Which 1951 treaty formally ended the Allied occupation and legal state of war with Japan in 1952?

The Treaty of San Francisco formally ended the Allied occupation and legal state of war with Japan in 1952.

Also called the Treaty of Peace with Japan, it was signed on 8 September 1951 at the War Memorial Opera House in San Francisco. Japan and 48 Allied nations signed the treaty, while the Soviet Union and two other participating countries declined to sign.

The treaty came into force on 28 April 1952. It restored Japan’s sovereignty, ended the Allied occupation, and set out Japan’s postwar renunciations of territorial claims. It therefore completed a diplomatic transition that began with the 1945 surrender.

The treaty is sometimes confused with the separate Treaty of Taipei, signed the same day it took effect. The San Francisco treaty primarily established peace between Japan and the Allied powers represented at the conference, rather than serving as the 1945 surrender document.