Japan captured Pohnpei from Germany, eventually leading to large-scale Japanese immigration to Micronesia.

Pohnpei is an island of the Senyavin Islands which are part of the larger Caroline Islands group. It belongs to Pohnpei State, one of the four states in the Federated States of Micronesia (FSM). Major population centers on Pohnpei include Palikir, the FSM's capital, and Kolonia, the capital of Pohnpei State. Pohnpei is the largest island in the FSM, with an area of 334 km² (129 sq mi), and a highest point of 782 m (2,566 ft), the most populous with 36,832 people, and the most developed single island in the FSM.

Japanese Micronesians, also Nikkei Micronesians or Micronesians of Japanese descent, refers to citizens of the Federated States of Micronesia (FSM) who are of Japanese descent and are members of the Japanese global diaspora known as the Nikkei (日系).