Koror was the capital of the South Pacific Mandate during the period of rule by the Empire of Japan.

Japan obtained control over the South Pacific Mandate, north of the equator.

When the military occupation gave way to the South Pacific Mandate, Mori stayed on.

In the census of December 1939, the total population of the South Pacific Mandate was 129,104, of which 77,257 were Japanese.

Japanese base at Truk, the pivot of the Japanese position in South Pacific Mandate.

However, the very limited cultivable land area of the South Pacific Mandate meant that fishing and whaling remained more economically important.

The police and security services in South Pacific Mandate and occupied Pacific areas were the charge of the Tokeitai.

The Japanese government encouraged immigration to the islands belonging to the South Pacific Mandate to offset demographic and economic problems facing Japan at that time.

Japan also received the South Pacific Mandate from the League of Nations.

Extensive economic improvements took place during the Japanese South Pacific Mandate of 1914 to 1945.