Forgetting that Canada avoided the great depression because it had no central bank.
From Wikipedia: In 1934, with only ten chartered banks still issuing notes, the Bank of Canada was founded and began issuing notes in denominations of $1, $2, $5, $10, $20, $25, $50, $100, $500 and $1000. In 1944, the chartered banks were prohibited from issuing their own currency, with the Royal Bank of Canada and the Bank of Montreal among the last to issue notes. From that point forward, the Bank of Canada has been the sole issuer of bank notes denominated in Canadian dollars. A liability of more than $12 million remains on the Bank of Canada's books up to the present day, representing the face value of Dominion of Canada, provincial, and chartered bank notes still outstanding.
The EU looked at the world and saw the dominance of the US dollar. They saw research that I have seen shows that the USA is 3% richer than it would be if the dollar was not the dominate currency in the word. They wanted a piece of that. They also thought that a common currency guided by an enlightened central bank.would be better for the Southern countries which had been prone to periods of inflation. Further that a single currency would facilitate trade within the EU. And so the Euro was created.
But big currencies mean big problems and we have Greece, Portugal, Spain and Italy with very high unemployment for 5 years! They are all struggling and falling deeper in debt.
And lest you get the wrong idea even Germany's real growth has been poor. And no one sees an easy way out.
Time to start thinking of smooth way out of the Euro mess.