Well there are always threats of war for any country it just depends on how high that threat is but I personally don't think so but there are a lot of thing that we don't get told.
Japan .
Its government committed Australia to the war, following slavishly the British lead, even though Germany did not pose a threat to Australia.
The Australian division in Malaya-Singapore was surrendered to the Japanese forces. The Japanese Navy moved south and bombed Australia. It was not threat of war, it was war because Australia had army, navy and air forces as part of the British defences of the South East Asian territories which Japan was attacking and taking over.
First to support the British war effort against Germany, then to defend itself against the threat of Japan.
There was no need to enter the war in Europe as there was no threat to Australia until it actually entered the war. This changed two tears later when Japan invaded South East Asia and captured New Guinea.
Hitlers plan was to conqour all of Europe, then expand. Australia, being that it is an island, would have nowhere to go if Hitler decided to invade. Hitler, in most peoples opinion, was sort of an underlying threat throughout the whole war, though Australia never actually acted on it.
We were fighting for our freedom but America was the biggest threat to the communist countries
As in WW1 against Germany, Australia was obliged to defend it's colony against Japan. So it recalled its troops from the Middle East where they were fighting a European war and faced this first major threat to itself. Previous commitments to wars were promoting the interests of Britain, not defence of Australia, but now Australia was under direct threat for the first time and the invasion of New Guinea posed a direct threat, and New Guinea became an essential part its own defence.
Australia saw commmunism coming be countries surrounding them were suffering from communism eg: Korea.
The Menzies government had committed Australia to World War 2, blindly following Britain. Our troops were committed to the war in Europe and the Middle East even though Germany was not threatening Australia. When the Japanese entered the war, there was a direct threat to Australia, and with Britain fully committed to Europe, Australia had no alternative to allying with the US for protection. This realism of meeting threats to Australia and Britain's post-war withdrawal from South East Asia meant that Australia's strategic interests were interlocked with those of the US in the Pacific.
There wasnt a battle that ended japans threat, inface U.S.A was losing but the two nuclear bombs in Hiroshima and nagasaki ended the Japanese threat.
if your essay is going to be in english, it looks like you're going to be having a problem.