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In 1901, following the federation of Australia’s colonies, Sydney became the capital of New South Wales and entered a new era of rapid transformation. Early 20th-century Sydney faced major public health challenges, including a bubonic plague outbreak in 1900, which led to large-scale redevelopment of the city’s waterfront and the removal of inner-city slums. This period marked the beginning of significant urban modernisation.
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During the First World War, Sydney contributed heavily to military enlistment, which reduced unemployment but also led to long-term social impacts. Returning soldiers were promised housing in newly planned suburbs such as Daceyville and Matraville, part of broader “garden suburb” movements that shaped Sydney’s urban design. Industrial and residential expansion also followed rail and tram corridors, and by 1926 the city’s population had reached one million, re-establishing Sydney as Australia’s largest city.
The interwar period saw major infrastructure development, including electrification of the rail network and the construction of the iconic Sydney Harbour Bridge, which opened in 1932. However, the Great Depression deeply affected Sydney, with unemployment rates exceeding 40% in working-class suburbs such as Redfern and Alexandria. Informal settlements emerged, and political tensions intensified, highlighted by the dramatic Harbour Bridge opening incident involving NSW Premier Jack Lang.
Sydney also played a central role in national celebrations and protests in 1938, marking 150 years since European settlement. While official celebrations highlighted the city’s prosperity, Aboriginal communities declared the day a “Day of Mourning,” reflecting the ongoing impact of colonisation.
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During the Second World War, Sydney experienced industrial growth and strategic military activity. The city faced direct threat when Japanese submarines attacked in 1942, resulting in casualties and heightened defence measures, including air raid shelters and harbour fortifications.
After the war, Sydney entered a period of rapid expansion driven by immigration and a baby boom. Large-scale migration from Europe and later Asia, the Middle East, and Africa transformed the city into one of the most culturally diverse urban centres in the world. Manufacturing initially dominated employment, but over time, service industries became the main economic driver.
By the mid-20th century, Sydney’s suburbs expanded rapidly across the Cumberland Plain, supported by government housing projects and infrastructure investment. Major cultural milestones followed, including the controversial but eventually iconic Sydney Opera House, which opened in 1973 and became a global symbol of the city.
In recent decades, Sydney has continued its transformation into a “world city,” driven by economic globalisation, migration, and urban development. By 2021, its population surpassed 5.2 million, with around 40% of residents born overseas. China and India became the largest sources of new migrants, reflecting Sydney’s growing international identity.
Today, Sydney stands as a dynamic global metropolis shaped by over two centuries of history, resilience, and cultural diversity.
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