Only one year after its foundation, the PRC entered into an mutually undeclared, informal war with the USA, South Korea, and the United Nations (UN) in Korea. After Japan's capitulation in 1945, the Korean territory north of the 38th parallel had been occupied by Soviet forces, and the south by American troops. In 1947, the contradictions between the USA and the USSR ruled out inter-allied trusteeship, which had originally been envisaged for the administration of Korea; and the USA decided to tr…