Canada's Prime Minister Mark Carney walks away from trade negotiations with Trump, choosing economic warfare over a deal he views as sovereign-threatening and industry-crushing. He's betting Canada can survive by pivoting to other trade partners while inflicting targeted pain on Republican states—a high-stakes gamble no other ally has dared attempt. The U.S. demanded Canada surrender trade autonomy by mirroring American tariff policy with third countries, effectively treating Canada like a dependent state rather than a sovereign nation.