The arrival of British settlers in Australia dramatically changed the lives of Indigenous Australians. When the First Fleet landed in 1788, Aboriginal and Torres Strait Islander peoples had already lived on the continent for tens of thousands of years with their own laws, customs and connections to Country. This essay focuses on three main ways their lives shifted in the early colonial period: populations were badly damaged by warfare and introduced diseases, traditional culture was undermined through policies of assimilation, and societal structures were disrupted once land was claimed by the British under the legal idea of terra nullius. Overall, these changes show that colonisation brought long-lasting harm to Indigenous communities and their ways of life.
Damage to Indigenous populations through war and disease
Indigenous Australian populations suffered severe losses during the early years of British colonisation because of both direct conflict and the rapid spread of new diseases. Before 1788, Aboriginal and Torres Strait Islander groups maintained stable numbers through careful land management and strong kinship systems that supported community health. The sudden arrival of thousands of British people and convicts brought illnesses such as smallpox, influenza and measles to which local peoples had no natural resistance or prior exposure. Historical accounts describe how entire clans along the Sydney coast were wiped out within months of the first outbreak in 1789, leaving surviving members unable to carry out normal hunting, gathering or ceremony. At the same time, frontier violence broke out as settlers expanded inland and Aboriginal warriors defended their territories, leading to further deaths on both sides but with a much heavier toll on Indigenous groups who lacked firearms. These events combined to shrink populations dramatically in the first decades of settlement, breaking family lines and leaving fewer people to pass on knowledge to the next generation. As a result, the damage to population numbers not only reduced the physical presence of Indigenous Australians but also weakened the social fabric that had sustained their communities for countless generations, making recovery far more difficult in the years that followed.
