Obvious answer: USA.
the pacific...
Europe and the Pacific
Australia fought in WW2 as an ally of Great Britain in both the European and pacific parts of WW2. Australia made its forces and its infrastructure available in the war against the Germans and the Japanese.
It was fought at Okinawa.
In the Pacific and the Caribbean.
in Europe and in the Pacific
Navy and men
WW2 was fought in most of the countries in Europe except Spain, Portugal, Switzerland and Sweden. - Also in Palestine, Egypt, Libya, Tunisia and Morocco. In the Pacific it was fought across most of the Pacific Islands and Burma, Singapore and Malaysia
In the Pacific and the Caribbean.
in Europe and in the Pacific
New Zealand was an ally to "the allies" i.e Great Britain, USA, Australia, most of the Nordic countries and numerous others from Europe and the pacific.
Japan