A New Discovery Changes How Scientists Understand Australia's Past

Hey, history and science explorers! Imagine trying to discover how many people lived across an enormous country more than 200 years ago, when there were no modern population databases or complete national records. How would scientists solve that mystery?

Researchers have taken on this challenge in Australia, working to understand the population history of Aboriginal and Torres Strait Islander peoples, Australia's First Peoples. Their findings suggest that the Indigenous population before European colonization was much larger than many earlier estimates indicated—and that the population loss that followed was devastating.

The study, published in Nature Human Behaviour, brought together researchers and Indigenous partners to investigate this important part of Australian history.

How Many People Lived in Australia Before 1788?

The research team estimated that approximately 2.22 million Indigenous people lived across Australia before the arrival of the British First Fleet in 1788. This is a median estimate, meaning it represents the middle of the model's range of possible population figures. It is not an exact headcount.

Why is this surprising? Some earlier estimates placed the pre-colonization population at around 250,000, while other estimates ranged up to about one million. The new figure is substantially higher than many of those earlier calculations.

Scientists believe older estimates may have been affected by incomplete records and population losses that had already occurred before reliable population counts were available. Disease, frontier violence, and other forms of colonial oppression contributed to the devastating impact on Indigenous communities.

How Did Scientists Investigate the Past?

You might be wondering: if there were no complete census records from that time, how could researchers estimate the population?

They combined several kinds of evidence. Archaeological findings can reveal where people lived and how they used the land. Genetic research can provide clues about population history. Historical and ethnographic accounts offer additional information, while environmental models help scientists estimate how many people different regions could have supported.

Think of it like solving a giant historical puzzle. One clue might be incomplete, but when scientists carefully compare many independent clues, they can build a more detailed picture of the past.

The researchers used these approaches alongside computer models to estimate the population before colonization and investigate what happened afterward.

A Devastating Decline After Colonization

The study also estimated the scale of the population decline between 1788 and 1861. According to the researchers' model, Australia's Indigenous population fell by approximately 93% during those 73 years, leaving around 7% of the estimated pre-colonization population.

The researchers estimated approximately 2.06 million excess deaths over this period. This is a model-based historical estimate, not a count of individually recorded deaths. The decline reflected the devastating consequences of colonization, including disease, violence, displacement, and systemic oppression.

These numbers describe a human tragedy, not simply a change in statistics. They represent the loss of lives, families, communities, knowledge, and cultural connections. Any account of this history must also recognize the strength and continuing presence of Indigenous peoples.

Why This History Still Matters Today

The research also examined how Indigenous population numbers have changed in more recent times. Australia's 2021 census recorded an Indigenous population equivalent to about 37% of the study's estimated median population before colonization. The researchers projected that, if population growth continued along the trends they studied, the population might reach that estimated historical level around 2047. This is a projection, not a guaranteed outcome.

Understanding population history matters because the effects of colonization can continue across generations. Research like this can contribute to truth-telling, historical understanding, reconciliation, and discussions about policies affecting Indigenous communities today.

What Can We Learn From This Discovery?

This study teaches us that science is not only about space, animals, or new technology. It can also help us investigate human history, especially when old records are incomplete or misleading.

By combining genetics, archaeology, environmental evidence, historical information, and computer models, researchers developed a new estimate that challenges earlier assumptions. The findings also remind us that Australia's Indigenous communities have endured enormous hardship while maintaining their cultures, identities, and connections to Country.

Here's a question to think about: if you had to reconstruct a country's history using only a few old records, archaeological discoveries, and scientific clues, which evidence would you investigate first—and how would you check whether your conclusions were fair?