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| 1925, Sept. 23 |
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| A new immigration restriction act gave the governor-general authority to prohibit the entrance of aliens of any specified nationality, class, race, or occupation, either for economic or racial reasons. This act was never systematically applied, but it made possible restriction of Italian immigration, which had begun to arouse objections, especially among the labor groups. | 1 |
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| 1926 |
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| The Northern Territory was divided along 20° S.L. into Northern Australia and Central Australia. The division was repealed in 1921. | 2 |
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| 1927, May 9 |
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| Parliament House was officially opened at Canberra. Thus far Parliament had sat at Melbourne while numerous schemes for the new capital were under debate. In a competition among architects, Walter B. Griffin of Chicago received first prize, and his plan became the basis for the new city. | 3 |
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| June 8 |
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| Financial agreement between the Commonwealth government and the state governments, following years of dispute concerning continued federal support to the states (the federal government having gradually appropriated most of the best springs of revenue). | 4 |
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