And vice versa.
The thousands of men who died on the south sea islands in WW2 were killed stopping a full occupation of Australia by Japan.
My great uncle was living in New Zealand, married to New Zealander and when war broke out he returned to the U.S. to join the Marines. Within a matter of days (he had already been in the Army) they sent him right back to the South Pacific. He had hoped he could at least get chance to see his mom in Maine before being sent back. Nope.
Yeh, we have a history of playing on the same team. The Brits and Europeans piss on the Americans sometimes for allegedly being late to enter WW2 but how many of them helped us out with the Japanese. ZERO. Maybe in small instances just protecting their own colonies, Burma something. Otherwise zero help in the war against Japan. The Aussies had skin in the game and the Japs had already bombed Port Moresby, and they were coming unless stopped.