Bayan yakin duniya na farko, Nauru ya zama mulkin mallaka na Majalisar Dinkin Duniya wanda Ostiraliya, New Zealand da Burtaniya ke gudanarwa. A lokacin yakin duniya na biyu, sojojin Japan ne suka mamaye Nauru, wanda Sojojin da ke gaba suka wuce a fadin Pacific. Bayan yakin ya ƙare, kasar ta shiga cikin kulawar Majalisar Dinkin Duniya. Nauru ta sami 'yancin kai a 1968, kuma ta zama memba na Pacific Community (SPC) a 1969. Tambaya: Wanene ya karɓi Nauru a lokacin yakin duniya na biyu?
Sojojin Japan