After being secured by Nationalist China, the island was placed under the administration of China's Guangdong Province. When the Chinese Communists gained control of mainland China, the defeated Nationalists retreated to Taiwan, but retained control of the Taiping garrison. Japan officially renounced its control and transferred the island to the trusteeship of the Allied Powers within the San Francisco Peace Treaty on September 8, 1951. A different interpretation is that Japan officially renounced its sovereignty and transferred the island to the Republic of China under the provisions of the Taipei Peace Treaty.