^
I was thinking something along those lines as well.
There are
cognitive benefits of being bi-lingual. At least in and around Montreal, a lot of people are bi-lingual, so I wonder if that's what's causing the effect.
My experience in Montreal a few weeks ago made me start wondering if French-English bilingualism should be expanded into Canada outside Quebec. Imagine if, say, someone traveling to Calgary finds out that a quarter of the population there speaks French, and a large % of the population is bilingual. In addition to the cognitive benefits, it would really make Canada even more distinct from the US.