A dramatic escalation in the longstanding U.S.–Canada trade relationship has thrust the two neighboring countries into an increasingly bitter dispute. President Donald Trump—long a vocal critic of Canadian trade policies—has declared a national emergency after,

Canada imposed a major electricity tax increase on U.S. consumers in northern border states. In retaliation, Trump announced plans to double tariffs on Canadian steel and aluminum exports from 25 percent to 50 percent and to “substantially increase” taxes on Canadian manufactured cars.