History of Sydney
With the inauguration of the Commonwealth of Australia on 1 January 1901, Sydney ceased to be a colonial capital and became the capital of the Australian state of New South Wales. With industrialisation, Sydney expanded rapidly, and by the early 20th century it had a population well in excess of one million.
New South Wales
During the 19th century, large areas were successively separated to form the British colonies of Tasmania (proclaimed as a separate colony named Van Diemen's Land in 1825), South Australia (1836), Victoria (1851) and Queensland (1859). Responsible government was granted to the New South Wales colony in 1855. Following the Treaty of Waitangi, William Hobson declared British sovereignty over New Zealand in 1840. In 1841 it was separated from the Colony of New South Wales to form the new Colony of New Zealand.