The difference between Canada and Australia is that Australia is an island nation.
An island nation means there's nowhere else to go, and it must rely on the navy.
At this time, England was very confident in its navy, being the world's number one naval power, with 33 battleships. This does not even include the obsolete pre-dreadnoughts, with the total naval tonnage reaching an astonishing 2.71 million tons.
Under these circumstances, England felt at ease with Australia, providing weapons and production rights whenever asked.
If Australia rebelled, they would just send the navy to blockade it.
Canada is different. It is adjacent to the United States in America, a country that could slip out of England's grasp into the embrace of the United States at any time.
Therefore, England always maintained a high level of vigilance towards Canada, consciously limiting its military industrial development.
The more the opponent fears something, the more I should provide it, Shire thought.
