What has Canada ever done to you? They are generally individually nice and very polite, why would you dump all our garbage in their lap.
I'd think something along the lines of a second Chicago fire or a new SF earthquake (to include LA) would do the job.
Regards,
GtG
One man’s trash is another man’s treasure.
I’m not an expert on Canadian history but I think many of the early English speaking settlers in what is now Canada came from the New England states. It’s possible Ottawa and Quebec would welcome our big cities with open arms.