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What was the name of the original unification of the Australian colonies, and what was the population at that time?

  1. Federation of Australia, 5 million

  2. Commonwealth of Australia, 2 million

  3. Union of Australia, 10 million

  4. Commonwealth of Australia, 4 million

The correct answer is: Commonwealth of Australia, 4 million

The original unification of the Australian colonies was known as the Commonwealth of Australia. At the time of this unification, the population was approximately 4 million. This historic event took place on January 1, 1901, when the six separate self-governing colonies came together to form the Commonwealth of Australia through the process of Federation. This marked the birth of the Australian nation as we know it today.