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In page Penal colony:

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Without the allocation of the available convict labour to farmers, to pastoral squatters, and to government projects such as roadbuilding, colonisation of Australia may not have been possible,[citation needed] especially considering the considerable drain on non-convict labor caused by several gold rushes that took place in the second half of the 19th century after the flow of convicts had dwindled and (in 1868) ceased. A proposal to make the Cape Colony a penal colony was deeply unpopular with local residents, sparking the Convict crisis of 1849.