The correct answer is that Canada was self-sufficient.
As Great Britain's economy was collapsing, much of the British Commonwealth followed. The exception was Canada because Canada was self-sufficient.
Canada had the proper means of production and plenty of natural resources such as wood, lakes, and sea to maintain certain stability during the collapse of Great Britain's economy. Canadian people were prepared con counter the economic difficulties of the moment, to the opposite of other members of the Commonwealth. This helped Canada to sort out the difficult moments and thrive after a while.