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

Among the countries that could have significantly benefited from taking over the South Pacific, the United States stands out. Control over this strategically important region would have enhanced its military presence and allowed for greater influence over trade routes and resources. Additionally, it would have provided the U.S. with a buffer against potential adversaries in Asia and strengthened its geopolitical standing during the Cold War and beyond. Access to the region's rich fisheries and potential mineral resources would have further bolstered economic interests.