CX helped the Canadians get visas so CX would not have any possibility of having to help those Canadians with a future version of the present "double taxation" issue.
CX can say, "You have the right to live and work in the USA, so, go there and you won't be liable for Canadian tax, nor will we."
It's like chess. We pilots look at the present move.
CX looks (suprisingly enough) at least one or two moves ahead.
No, I'm not referring to the basing office. I'm referring to those who have run this colonial enterprise since the 1700's.