1919 Secret treaty agreement between Japan and Britain guaranteeing Japanese control over all Pacific islands north of the Equator announced to the world in the Treaty of Versailles.
1920 -1940 Rapid Japanese settlement in Yap. Population of Japanese on Yap Islands jumps from 97 to 1,933.
1920 Typhoon kills seven.
1921 Japan and United States sign treaty recognizing American rights to use Yap's cable station.
1922 Japanese civilian administration begins under League of Nations Mandate. Tattooing banned.

1925 Typhoon destroys nearly all homes on Yap.
1935 Japan leaves League of Nations. Begins fortification of Yap.
1938 -1939 Military preparations begin. Yapese are forced to work in labor gangs. Nickel mine opens in Gagil. Strip mining for bauxite and phosphate on Yap and Fais.
1941 -1942 World War II begins. Japanese build lighthouse in Gagil and intensive gardening begins in a large part of southern Yap.
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