The pigheadedness of Australia PM (for the racist white Australia Policy - which many other nations, including especially the USA were keen to let the Aussies be the fall guy) alienated Japan (and others), and led to the destruction of the League of Nations, and the militarism which led to Japan trying to take over as much as it could grab.
But Australia was only a short while ago the staunchest ally of the USA... and if we kicked them out of here with their nuclear ships in our ports and spy bases, and satellite monitoring stations for both military and NASA, it would hurt the USA critically in (attempted) world domination. And our Special forces were only a short while ago praised as the best in the world, and at the beck and call of the USA...