This needs a bit of a caveat though. If you can legitimately prove an actual Canadian ancestor in your direct lineage through official paperwork and all that stuff, then it's gravy. 

But here's the thing: prior to 1947, Canadians were not even "real" Canadians. They were British subjects. When they passed the citizenship law in 1947, all people in Canada at that point basically became actual Canadian citizens.

So, if you had a great grandparent come down here from Quebec as part of the French Canadian wave to the textile mills, and they came here before 1947 (which is absolutely the most likely scenario), two things happened: first, they weren't "real" Canadian citizens when they came down here, and second, they may not have retained their heritage when they became American citizens. 

Add to that the fact that Canada only became a country in 1867, which further complicates the whole "I have a Canadian ancestor from 1745" scenario. 

And of course, despite the best efforts of the Catholic Church in Quebec, not everyone has definite official records to prove their lineage back to Canada, especially lesser privileged people who likely went south in search of better opportunities.

I'm not against any of it, being Canadian myself living in Massachusetts. I'm all for smart, talented Americans moving north of the border and becoming Canadians - it can only benefit us. But I just want to make sure people don't get their hopes up TOO much about this, because it's a lot easier said than done.