In the long arc of North American economic integration, Tuesday's announcement marks a striking reversal: the United States, Canada's closest partner and largest trading destination, is now deploying import bans and steep tariffs as instruments of coercion. President Trump's new measures — targeting Canadian dairy, alcohol, motorcycles, and a range of consumer goods — arrive just one day after Ottawa's own retaliatory duties, compressing what once took years of negotiation into days of escalation. The dispute is no longer merely about trade balances; it has become a contest over sovereignty, d