General Order No. 1 in the context of "Harry Truman"

The division of Korea began at the end of World War II on 2 September 1945, with the establishment of a Soviet occupation zone and a US occupation zone. These zones developed into separate governments, named the Democratic People's Republic of Korea (North Korea) and the Republic of Korea (South Korea), which fought a war from 1950 to 1953. Since then the division has continued.

By the early 20th century, both countries were one single nation: the Korean Empire. During World War II, the Allied leaders had already been considering the question of Korea's future following Japan's eventual surrender in the war. The leaders reached an understanding that Korea would be removed from Japanese control but would be placed under an international trusteeship until the Koreans would be deemed ready for self-rule. In the last days of the war, the United States proposed dividing the Korean peninsula into two occupation zones (a U.S. and Soviet one) with the 38th parallel as the dividing line. The Soviets accepted their proposal and agreed to divide Korea, which led to the declaration of General Order No. 1.

On 25 October 1945, Japan handed over Taiwan and Penghu to the Republic of China, as a result of World War II. This marked the end of Japanese rule and the beginning of post-war era of Taiwan. This event was referred to by the Republic of China as the retrocession of Taiwan (臺灣光復). The Republic of China government viewed this as the restoration of Chinese sovereignty over Taiwan, following its cession to Japan in 1895 after the Qing dynasty's defeat in the First Sino-Japanese War. Therefore, the event was named "retrocession", a notion that has been controversial since the democratisation of Taiwan in the 1990s. The date of the handover is annually celebrated as the Retrocession Day, which was a public holiday in Taiwan from 1946 to 2000, and again from 2025. The day has also been marked as a memorial day in mainland China since 2025.

On 15 August 1945, Japan announced its surrender following its defeat in World War II. On 2 September, Douglas MacArthur, Supreme Commander of the Allied Powers, issued General Order No. 1, instructing Japanese forces in various locations to surrender to the Allies. The order specified that Japanese troops in Taiwan were to surrender to the Chinese leader Chiang Kai-shek. Chiang delegated He Yingqin as his plenipotentiary for the surrender process, who further appointed Chen Yi to oversee the surrender in Taiwan. The Governor-General of Taiwan and Commander of the Japanese 10th Area Army, Rikichi Andō, on behalf of Japan, surrendered to Chen Yi at the Taipei Public Hall on 25 October, signing the documents to formalise the transfer.