When did Australia separate from Britain?
Constitutional history of Australia
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Between 1855 and 1890, the six colonies individually gained responsible government, managing most of their own affairs while remaining part of the British Empire.[24] The Colonial Office in London retained control of some matters, notably foreign affairs,[25] defence,[26] and international shipping. New Zealand achieved responsible government in 1853, New South Wales and Victoria in 1855, Tasmania in 1856, Queensland in 1859 (separated from New South Wales in that year with self-government from the beginning) and Western Australia in 1890. These arrangements were confirmed by the Colonial Laws Validity Act 1865.