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Australia joined World War 2 when Britain and Germany went to war. As an associate of Britain, Australia's protection was linked to the welfare of Britain - should it fall, then Australia would have been left open to invasion from Japan.
The independent countries in the British Commonwealth - Canada, Australia, New Zealand and South Africa - declared war very shortly after Britain in 1939.

They were allied with Great Britain( also know as the Commonwealth) and were forced to join the war when it broke out. Japan also attacked Australia for it's rare materials( iron, coal, etc.) which Japan had few of.

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They joined world war 2 because Britain did, Australia was a part of Britain so if they were at war, so was Australia.

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9y ago

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