Large-scale Japanese settlement in Micronesia occurred in the first half of the 20th century when Japan colonised much of Micronesia. Modern-day Micronesian territories of the Northern Mariana Islands, the Federated States of Micronesia, Palau and the Marshall Islands were between 1914 and 1945 part of the Japanese-governed, League of Nations-created South Pacific Mandate, known in Japan as Nanyo. During the Second World War, the Japanese settlers outnumbered the Micronesians within the mandate territory and extensively intermarried with Micronesians, raising families locally. A few Japanese also resided in Kiribati and Nauru, where they worked as contract labourers or established businesses.
After 1945, most of the Japanese settlers were repatriated to Japan, but the offspring of Japanese settlers and Micronesians were allowed to remain behind. These offspring usually identify themselves as Micronesians rather than Japanese, and constitute a sizeable minority in each of the territories' populace.