colony · Korea and Japan
South Seas Mandate
Origins
Early in the First World War the Japanese navy seized Germany's island colonies north of the equator: the Marianas except Guam, the Carolines, Palau and the Marshalls. In 1919 the League of Nations gave them to Japan as a mandate, and in 1922 a civilian South Seas Government was set up at Koror in Palau.
Rule and society
Japan developed sugar plantations on Saipan and Tinian through the South Seas Development Company, phosphate mining and fisheries. Japanese settlers, many from Okinawa, came to outnumber the islanders by the late 1930s, and schools taught Japanese. Japan left the League in 1933 but kept the islands and turned Truk into a major naval base.
Decline and legacy
American forces captured the islands in 1944 and 1945 in battles at Saipan, Peleliu and elsewhere; the atomic bomb missions flew from Tinian. In 1947 the United Nations placed them under American trusteeship, from which today's island states emerged.
Lineage
On the connections map
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- South Seas Mandate was a colony of Empire of Japan1919 CE – 1945 CE
More states of Korea and Japan →
Cite this page
- APA
- The Epoch Institute. (2026). South Seas Mandate. In The Epoch Institute States Register. https://the-epoch-institute.org/state/south-seas-mandate
- MLA
- “South Seas Mandate.” The Epoch Institute States Register, The Epoch Institute, 2026, https://the-epoch-institute.org/state/south-seas-mandate. Accessed .
- Chicago
- The Epoch Institute. “South Seas Mandate.” The Epoch Institute States Register. 2026. https://the-epoch-institute.org/state/south-seas-mandate.
- Harvard
- The Epoch Institute (2026) ‘South Seas Mandate’, The Epoch Institute States Register. Available at: https://the-epoch-institute.org/state/south-seas-mandate (Accessed: ).
Last reviewed October 2026Random state ↻