Portal:Australia/Anniversaries/March/March 31
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- 1909 – Victoria is the last Australian state to grant women's suffrage.
- 1921 – The Australian Air Force is established, it officially becomes the Royal Australian Air Force in August.
- 1928 – The first Australian Grand Prix motor race was held at Phillip Island.
- 2002 – Janelle Patton becomes Norfolk Island's first murder victim in 150 years.