South Seas Mandate

thumb|Japanese map of the mandate area in the 1930s

The South Seas Mandate, officially the Mandate for the German Possessions in the Pacific Ocean Lying North of the Equator, was a League of Nations mandate in the "South Seas" given to the Empire of Japan by the League of Nations following World War I. The mandate consisted of islands in the north Pacific Ocean that had been part of German New Guinea within the German colonial empire until they were occupied by Japan during World War I. Japan governed the islands under the mandate as part of the Japanese colonial empire until World War II, when the United States captured the islands. The islands then became the United Nations-established Trust Territory of the Pacific Islands governed by the United States. The islands are now part of Palau, the Northern Mariana Islands, the Federated States of Micronesia, and the Republic of the Marshall Islands.

In Japan, the territory is known as and was governed by the .

Origin

Japanese interest in what it called the began in the 19th century, prior to its imperial expansion into Korea and China. By 1875, ships from the newly established Imperial Japanese Navy (IJN) began to hold training missions in the area. Shiga Shigetaka, a writer who accompanied a Navy cruise to the region in 1886, published his in 1887, marking the first time a Japanese civilian published a firsthand account of Micronesia. Three years later, Shiga advocated for annexation of the area by claiming that doing so would "excite an expeditionary spirit in the demoralized Japanese race." Despite the appeal imperialism had for the Japanese public at the time, neither the Meiji government nor the Navy seized any pretexts to fulfill this popular aspiration. It was through the commercial operations of fisherman and traders that the Japanese first began to make a wider presence in the region, which continued to grow despite challenges from competing German commercial interests. Although the Japanese public's enthusiasm for southward expansion had abated by the turn of the century, a number of important intellectuals, businessmen, and military officials continued to advocate for it. Among them were Admiral Satō Tetsutarō and Diet member Takekoshi Yosaburō. The latter declared that the future of Japan "lies not in the north, but in the south, not on the continent, but on the ocean" and that its "great task" was to "turn the Pacific into a Japanese lake."

By the outbreak of World War I the empire included Taiwan, Korea, the Ryukyu Islands, the southern half of Sakhalin island (Karafuto Prefecture), the Kuril Islands, and Port Arthur (Kwantung Leased Territory). The policy of Nanshin-ron ("Southern Expansion Doctrine"), popular with the IJN, held that Southeast Asia and the Pacific Islands were the area of greatest potential value to the Japanese Empire for economic and territorial expansion.

The Anglo-Japanese Alliance of 1902 had been signed primarily to serve Britain's and Japan's common interest of opposing Russian expansion. Amongst other provisions the treaty called on each party to support the other in a war against more than one power, although it did not require a signatory state to go to war to aid the other. Within hours of Britain's declaration of war on Germany in 1914, Japan invoked the treaty and offered to declare war on the German Empire if it could take German territories in China and the South Pacific. The British government officially asked Japan for assistance in destroying the raiders from the Imperial German Navy in and around Chinese waters, and Japan sent Germany an ultimatum demanding that it vacate China and the Marshall, Marianas and Caroline Islands. The ultimatum went unanswered and Japan formally declared war on Germany on 23 August 1914. and protection of the shipping lanes for Allied commerce in the Pacific and Indian Oceans. During the course of this operation, the Japanese Navy seized the German possessions in the Marianas, Carolines, Marshall Islands and Palau groups by October 1914.

After the end of World War I, the protectorate of German New Guinea was divided amongst the war's victors by the Treaty of Versailles. The southern part of the protectorate was mandated to come under Australian administration as the Territory of New Guinea, consisting of Kaiser-Wilhelmsland (the German territory on the island of New Guinea) and the German-controlled islands south of the equator. Meanwhile, Japanese occupation of the northern part of the protectorate, consisting of the Micronesian islands north of the equator, was formally recognized by the treaty. Japan was given a League of Nations Class C mandate to govern them, the C Class being assigned because the Mandates Commission regarded the islands as having "low cultural, economic and political development". The terms of the Mandate specified that the islands should be demilitarized and Japan should not extend its influence further into the Pacific. The Mandate was initially subject to yearly scrutiny by the Permanent Mandates Commission of the League of Nations in Geneva, As there was no legal requirement for Japan to be a League member for it to have a mandate over the islands, it continued to administer them and submitted annual reports to the League until the outbreak of World War II. The idea of reassigning the mandate was considered by the League and the great powers but proved to be impractical.

Administration

thumb|Flag of the Governor of the Mandate

Following the initial Japanese occupation of the islands, a policy of secrecy was adopted. Japan made it plain that it did not welcome the entry of foreign ships, even those of its wartime allies, into Micronesian waters. During the first five years that Japan occupied the islands, it consolidated its presence and the islands became a virtual Japanese colony. The IJN divided the territory into five naval districts in Palau, Saipan, Truk, Ponape and Jaluit Atoll, all reporting to a rear admiral at the naval headquarters at Truk.

thumb|upright|left|Native [[Micronesia#Demographics|Micronesian teaching assistant (left) and constables (middle and right) of Japanese Truk Island, c. 1930. Truk became a possession of the Empire of Japan under a mandate from the League of Nations following Germany's defeat in World War I. and its possession gave an impetus to the Nanshin-ron doctrine of "southward advance".

Population

thumb|Korean Cafe in Saipan, 1939. The banner spells [[Arirang in katakana.]]

The population of the islands increased during the period of the mandate as a result of Japanese settlement in Micronesia. Settlers were initially drawn from Okinawa Island and the other Ryukyu Islands, but immigrants subsequently came from other parts of Japan, particularly the economically deprived Tōhoku region. Agricultural workers were followed by shopkeepers, restaurant, geisha house and brothel-keepers, expanding former German settlements into Japanese boom towns. The initial population figures (1919–1920) for the mandated territories included around 50,000 islanders, made up from the indigenous peoples of Oceania. Japanese immigration led to the population growing from under 4,000 in 1920 to 70,000 inhabitants in 1930, and more than 80,000 in 1933. By 1935 the Japanese population alone was more than 50,000. By 1937 almost 90 percent of the population on Saipan was Japanese (42,547 out of 46,748). In 1890, Japan established commercial relations with some of the Spanish and German firms already trading in the islands. Japan began to exert control over the copra and fishing industries, but this control was lost following the 1899 purchase of the islands by Germany. Small groups of Japanese entrepreneurs continued to establish commercial ventures in German Micronesia that made up a significant proportion of the islands' trade. However, the economic development of the area was hampered by the distances separating the islands, by their small land areas and by their small market sizes. Japan also suffered from the German Imperial policy of expanding German interests there and discriminating against the Japanese. Bananas, pineapples, taro, coconuts, In 1937 the mother-of-pearl industry became lucrative

Saipan in the Mariana Islands supported the Battle of Guam.
Truk in the Caroline Islands became the base for amphibious landings on Tarawa and Makin in the Gilberts during the Japanese occupation of the Gilbert Islands, as well as Rabaul in the Australian mandate Territory of New Guinea.
Kosrae was used to relocate evacuated Ocean Island workers.
Majuro in the Marshall Islands was used in air strikes against Howland Island.
Jaluit Atoll, also in the Marshall Islands, was the base from which the IJN seized Nauru and Ocean Island (now known as Banaba Island).

The Imperial Japanese Army also utilized the islands to support air and land detachments.

In order to capture the islands from Japan, the United States military employed a "leapfrogging" strategy which involved conducting amphibious assaults on selected Japanese island fortresses, subjecting some to air attack only and entirely skipping over others. This strategy caused the Japanese Empire to lose control of its Pacific possessions between 1943 and 1945.

The League of Nations mandate was formally revoked by the United Nations on 18 July 1947 pursuant to Security Council Resolution 21, making the United States responsible for administration of the islands under the terms of a United Nations trusteeship agreement which established the Trust Territory of the Pacific Islands. Most of the islands subsequently became part of independent states.

South Seas Mandate

Origin

Administration

Population

See also

Citations

References

Further reading

External links