query: When did Australia become a commonwealth?
passage: Federation of Australia
The Federation of Australia was the process by which the six separate British self-governing colonies of Queensland, New South Wales, Victoria, Tasmania, South Australia, and Western Australia agreed to unite and form the Commonwealth of Australia, establishing a system of federalism in Australia. Fiji and New Zealand were originally part of this process, but they decided not to join the federation.[1] Following federation, the six colonies that united to form the Commonwealth of Australia as states kept the systems of government (and the bicameral legislatures) that they had developed as separate colonies, but they also agreed to have a federal government that was responsible for matters concerning the whole nation. When the Constitution of Australia came into force, on 1 January 1901, the colonies collectively became states of the Commonwealth of Australia.
passage: Colonial forces of Australia
By 1901, the Australian colonies were federated and formally joined together to become the Commonwealth of Australia, and the federal government assumed all defensive responsibilities. The Federation of Australia came into existence on 1 January 1901 and as of that time the constitution of Australia stated that all defence responsibility was vested in the Commonwealth government. Co-ordination of Australia-wide defensive efforts in the face of imperial German interest in the Pacific Ocean was one of the main reasons for federation, and so one of the first decisions made by the newly formed Commonwealth government was to create the Department of Defence which came into being on 1 March 1901. From that time the Australian Army came into being under the command of Major General Sir Edward Hutton, and all of the colonial forces, including those then on active service in South Africa, transferred into the Australian Army.