The Treaty of San Francisco, officially known as the Treaty of Peace with Japan, was signed on September 8, 1951. It formally ended the state of war between the Allied Powers and Japan following World War II. The treaty laid the groundwork for Japan's post-war recovery and established its sovereignty, while also addressing issues such as reparations and territorial disputes. The treaty was signed by 48 nations, including the United States and the United Kingdom, but notably excluded the Soviet Union and several other countries. It came into effect on April 28, 1952, marking a significant step in Japan's reintegration into the international community.