The expansion of British control over other areas of the continent began in the early 19th century, initially confined to coastal regions. A settlement was established in Van Diemen's Land (present-day Tasmania) in 1803, and it became a separate colony in 1825.[76] In 1813, Gregory Blaxland, William Lawson and William Wentworth crossed the Blue Mountains west of Sydney, opening the interior to European settlement.[77] The British claim was extended to the whole Australian continent in 1827 when Major Edmund Lockyer established a settlement on King George Sound (modern-day Albany, Western Australia).[78] The Swan River Colony was established in 1829, evolving into the largest Australian colony by area, Western Australia.[79] In accordance with population growth, separate colonies were carved from parts of New South Wales: South Australia in 1836, New Zealand in 1841, Victoria in 1851, and Queensland in 1859.[80] The Northern Territory was excised from South Australia in 1911.[81] South Australia was founded as a "free province"—it was never a penal colony.[82] Western Australia was also founded "free" but later accepted transported convicts, the last of which arrived in 1868, decades after transportation had ceased to the other colonies.[83] By 1850, Europeans still had not entered large areas of the inland. Explorers remained ambitious to discover new lands for agriculture or answers to scientific enquiries.[84] A series of gold rushes beginning in the early 1850s led to an influx of new migrants from China, North America and mainland Europe, [85] and also spurred outbreaks of bushranging and civil unrest. The latter peaked in 1854 when Ballarat miners launched the Eureka Rebellion against gold license fees.[86] Between 1855 and 1890, the six colonies individually gained responsible government, managing most of their own affairs while remaining part of the British Empire.[87] The Colonial Office in London retained control of some matters, notably foreign affairs, [88] defence, [89] and international shipping.