While there were only a relatively small number of attacks on civilian targets, many Australians feared that the country would be invaded during the early years of the Pacific War.
Menzies called for an ‘all in’ war effort and, with the support of Curtin, amended the National Security Act to extend government powers to tax, acquire property, control businesses and the labour force and allow for conscription of men for the "defence of Australia".
[5] In July 1940, the Menzies government imposed regulations under the National Security Act placing virtually all of Australia's newspapers, radio stations, and film industry under the direct control of the Director-General of Information.
[14] With the 1940 election looming, a Royal Australian Air Force crash at Canberra Airport in August 1940 resulted in the death of the Chief of the General Staff and three senior ministers.
[3] The Labor Party meanwhile experienced a split along pro- and anti-Communist lines over policy towards the Soviet Union for its co-operation with Nazi Germany in the invasion of Poland.
[15] Cameron resigned as Country Party leader in October 1940, to be replaced by Arthur Fadden, who became Treasurer and Menzies unhappily conceded to allow Page back into his ministry.
In January 1941, Menzies flew to Britain to discuss the weakness of Singapore's defences and sat with Winston Churchill's British War Cabinet.
He was unable to achieve significant assurances for increased commitment to Singapore's defences, but undertook morale boosting excursions to war affected cities and factories.
In Menzies's absence, Curtin had co-operated with Deputy Prime Minister Arthur Fadden in preparing Australia for the expected Pacific War.
With the threat of Japan imminent and with the Australian army suffering badly in the Greek and Crete campaigns, Menzies re-organised his ministry and announced multiple multi-party committees to advise on war and economic policy.
Unable to secure Curtin's support, and with an unworkable parliamentary majority, Menzies resigned as prime minister and leader of the UAP on 29 August 1941.
Eight weeks after the formation of the Curtin government, on 7 December 1941 (eastern Australia time), Japan attacked Pearl Harbor, the US naval base in Hawaii.
On 27 December 1941, Curtin demanded reinforcements from Churchill, and published an historic announcement:[16] "The Australian Government...regards the Pacific struggle as primarily one in which the United States and Australia must have the fullest say in the direction of the democracies' fighting plan.
Without inhibitions of any kind, I make it clear that Australia looks to America, free of any pangs as to our traditional links or kinship with the United Kingdom.
On 19 February, Darwin suffered a devastating air raid, the first time the Australian mainland had ever been attacked by enemy forces.
[18] U.S. President Franklin Roosevelt ordered his commander in the Philippines, General Douglas MacArthur, to formulate a Pacific defence plan with Australia in March 1942.
[16] The Australian Women's Land Army was formed on 27 July 1942 under the jurisdiction of the Director General of Manpower to combat rising labour shortages in the farming sector.
Curtin hoped this might influence the British to despatch men and equipment to the Pacific, and the appointment reaffirmed the important role of the Crown to Australia at that time.
He returned to Australia and campaigned for an unsuccessful 1944 referendum to extend federal government power over employment, monopolies, Aboriginal people, health and railway gauges.
[22] Following his 1945 election as leader of the Labor Party, Chifley, a former railway engine driver, became Australia's 16th prime minister on 13 July 1945.