Rubuta ci gaba don wannan sakin layi - Arewacin Halmahera, musamman Morotai, sun taka rawa a Yaƙin Duniya na II. Jafananci sun kama tsibirin Morotai a farkon 1942. Sojojin Amurka ne suka kwace kudancin filayen Morotai a watan Satumbar 1944 yayin yakin Morotai
, kuma an yi amfani da shi a matsayin wurin da za a yi amfani da shi don mamayewar Allied na Philippines a farkon 1945, da Borneo a watan Mayu da Yuni na wannan shekarar. An gano sojan Japan Teruo Nakamura a cikin dajin Morotai a cikin 1974, a matsayin ɗaya daga cikin Sojojin Yaƙin Duniya na II na Jafananci waɗanda suka ci gaba da jimrewa bayan ƙaddamar da sojojin Japan. Tsibirin Morotai, tun daga shekarar 2009, ba ya cikin yankin Arewacin Halmahera.