Which country would have benefited the most by taking over the South Pacific?

Actualy the country who benefits more is China which is now a leading player in the South Pacific and multiple Chinese political and economic actors are engaging with the region. China is so engaged with the south pacific that we can state firmly that multiple actors are now involved in Chinese foreign policy. Its neighbors like Kiribati, Marshall Islands, Nauru, Palau, Tuvalu, Solomon Islands, recognise China as the most assertive foreign policy from the south pacific

Japan would have benefited the most by taking over the Pacific