Both of my daughters were born in Ottowa although their memory of Canada (if any) is pretty vague. We left Canadian snow for California sun some 15 years ago.
One way to deal with lack of gifted resource in Canada is to vote with your feet. However, this may not be an option for many parents. If you can't move, then I would suggest that you work with school and teachers to explore other opportunities such as extra homework, subject acceleration, grade skipping, etc. When the kids are old enough, get them tested and join the programs like CTY and YSP (most of these programs are open to Canadians). They can participate in on-line classes, summer activities, competitions, etc.
Things are usually better when they get into high school. More options open up such as taking class in college, AP classes, and dual enrollment. (Not sure whether Canadian HS has AP classes or not.) Again, a lot summer camps, internships are open to Canadian students.
If you are thinking to send your gifted child to US universities, you probably need to plan years ahead. As I understand, the way that American universities admit students is quite bit different from that of Canadian universities. It is more holistic approach rather than mainly based on grades and test scores. You also need to save a lot of money. We received 1st USC (education saving plan) check for my older daughter who is at a private college now. Just around $3000 which is enough to cover one tenth of cost. Better than nothing but not much better.
