Re: Canada joining the USA?
A decade or more ago, there was a parti sécessioniste led by mr René Lévesque (if I remember well). At that time, the threats were real, but nowadays it's over. I'm sure that as soon as the french speaking Canadians see that they are culturally and economically important in their country, their confidence would be sufficient not to want to split the country anymore. And the immigration is a good thing too.
Raoul