It's a bit much to claim that Canada opposed the U.S. war on Vietnam, and ludicrous to think that made Canada "a major player on the world stage". The Pearson government spied on behalf of the U.S. as a member of the International Control Commission, did nothing to stop Canadians fighting for the Pentagon, and happily allowed Canadian companies to sell oodles of war materiel, probably including horrible chemicals, to the Pentagon. 
When Noam Chomsky pointed out some of this on CBC, Saint Peter Gzowski blew a gasket on air ... but later had to apologize.
At least you didn't launch a similar claim about Chretien's official (but not unofficial) refusal to endorse Bush's invasion of Iraq. But that's probably because you ran out of space.