The prospect of America expanding north is a reminder of the historical threats of invasion Canada has faced, and efforts toward closer economic integration.

Having already forced Colombia to accept deportees by threatening a 25% tariff, President Donald Trump is readying the same move against Canada and Mexico as soon as Saturday. But this time, the stakes are higher and many economists surveying the possible damage doubt Trump would be comfortable with what they say would be self-inflicted wounds from the tariffs.

The Trudeau government and regional leaders have put into place a retaliation strategy that's ready to go as leaders call for a national buy-Canadian response to President Donald Trump's tariff plans.