On which date did the six colonies join to form the Commonwealth of Australia?

Answer and explanation

Correct answer: D. 1 January 1901, when the Constitution came into force

  1. Step 1: Federation took effect on the first day of the twentieth century, when the Constitution came into force. Answer: 1 January 1901. Why not the others: 26 January 1788 is the First Fleet landing, 25 April 1915 is the Gallipoli landing, and 9 May 1927 is the opening of Parliament House in Canberra.

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