They have kept their flags most probably because they are sensitive about they isolation from their European roots and culture. They probably see it as a sort of anchor and reminder of where they are from.
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All Of The AboveApex
Dark blue was the colour of the British blue ensign, which was used in colonial times for the flags of most colonies and south of the equator, such as Australia and New Zealand.
All of the states of Australia were originally separate British colonies.
Australia, New Zealand, Canada and Ireland were all once part of the British Empire, as they were British colonies. Australia, New Zealand and Canada are now all members of the Commonwealth of Nations. Ireland is not a member of the Commonwealth of nations.
Neither New Zealand or Australia are "dominions of England". Both are independent countries, with a parliamentary democracy. There is The Commonwealth, which is composed of many of the former members of the British Colonies, but not all Commonwealth members are ex British colonies, nor are all ex-colonies members of The Commonwealth.
The United Kingdom administered both New Zealand and the Australian colonies. Both were part of the British Empire.
What were New Zealand and Australia for the British
Abel Tasman was the first to sight both countries but Captain James Cook was the first to land. Of course there were numerous native tribes there for hundreds of years (the Australian Aborigines and New Zealand Maori). Incidentally, James Cook did not discover Australia, nor was he the first to land there, but he was the first to land on both countries.
At the height of the British Empire in the 19th century, Britain had around 50 colonies including Australia, Canada, India, New Zealand, South Africa and Zimbabwe (Rhodesia).
Australia and New Zealand used to be colonies of the United Kingdom (Great Britain).
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