ethnically cleansed the western half of Van Diemen's Land." Nevertheless, Clements and Flood note that there was another wave of violence in north-west Tasmania in 1841, involving attacks on settlers' huts by a band of Aboriginal Tasmanians who had not been removed from the island. Proclamation as a colony Van Diemen's Landwhich thus far had existed as a territory within the colony of New South Waleswas proclaimed a separate colony, with its own judicial establishment and Legislative Council, on 3 December 1825. Transportation to the island ceased in 1853 and the colony was renamed Tasmania in 1856, partly to differentiate the burgeoning society of free settlers from the island's convict past. The Legislative Council of Van Diemen's Land drafted a new constitution which gained Royal Assent in 1855. The Privy Council also approved the colony changing its name from "Van Diemen's Land" to "Tasmania", and in 1856 the newly elected bicameral parliament sat for the first time, establishing Tasmania as a self-governing colony of the British Empire. The colony suffered from economic fluctuations, but for the most part was prosperous, experiencing steady growth. With few external threats and strong trade links with the Empire, Tasmania enjoyed many fruitful periods in the late 19th century, becoming a world-centre of shipbuilding. It raised a local defence force that eventually played a significant role in the Second Boer War in South Africa, and Tasmanian soldiers in that conflict won the first two Victoria Crosses awarded to Australians. Federation In 1901 the Colony of Tasmania united with the five other Australian colonies to form the Commonwealth of Australia. Tasmanians voted in favour of federation with the largest majority of all the Australian colonies. 20th and 21st century Tasmania was the first place in the southern hemisphere to have electric lights, starting with Launceston in 1885 and Zeehan in 1900. The state economy was riding mining prosperity until World War I. In 1901, the state population was 172,475. The 1910 foundation of what would become Hydro Tasmania began to shape urban patterns, as well as future major damming programs. Hydro's influence culminated in the 1970s when the state government announced plans to flood environmentally significant Lake Pedder. As a result of the eventual flooding of Lake Pedder, the world's first green party was established; the United Tasmania Group. National and international attention surrounded the campaign against the Franklin Dam in the early 1980s. In 1943,