Did Canada's role in response to world events from World War I through the modern day make the country stronger or weaker?

Canada was not consulted as to whether or not they would
go to war in World War I, as they were still part, more or less, of the British Empire
and felt honor bound to defend the Mother Country.  Their sacrifice was significant, and
more than most people realize, as they lost 67,000 killed and 173,000 wounded, in a
country with less than 20 million people total.  While on the winning side, I would say
such a sacrifice in blood and treasure weakened both Canada and
Britain.

World War II was a slightly different situation,
as Canada was an independent nation as of 1931, and entered the war as a member of the
British Commonwealth considerably later than Britain and France did, and by a vote of
Parliament.  Their contribution to the war effort was no less significant, as over a
million Canadians served in the war, their military participated in the D-Day landings,
and their Navy and Air Force were crucial to the Allied supply effort.  The threat was
more grave, in my opinion, in World War II, since actual occupation of England was a
possibility, and loss of the shipping lanes in the Atlantic and Pacific even more
likely.  While her sacrifice was great, the peace and security Canada bought with those
losses was real and lasting.

Canada's contributions to
either the Cold War or the War on Terror have been much more limited in scope, meeting
her obligations to the NATO treaty alliance but maintaining a very limited armed
forces.  Blessed by geography and a relatively sustainable economy and energy supply,
Canada has faced less security threats in the modern day, and I think, has felt less
obligation to engage threats to her allies.  Canada has thus emerged as one of the more
stable economies even in the face of world recession.