Because they were helping USA when the Japanese were fighting against them.
japanese and australia
Australia had declared war on Japan.
Because we were at war with them
japanese and Australia
Protect Australia from Japanese attacks and an invasion.
Australia was the foot hole for the allied troops to mount an attack on Japanese forces. The battle of Guadalcanal was the deciding battle in preventing the Japanese invasion of Australia.
Australia entered the war with Japan in 1941 because of the bombing by Japanese planes that occurred in the Hawaiian Islands. After the Japanese were done with the Americans, they turned their submarine and air force warfare towards Australia.
Australia in 1942
well Australia british,japanese
BECAUSE OF JAPANESE EXPANSION TO THE AUSTRAILIAN MAINLAND
Australia was in the war on the side of the Allies, making them the enemies of the Japanese, who were trying to gain control of Asia.