"Canada has to choice but to retaliate with a measured, reciprocal dollar-for-dollar response. That is what we are doing," said Foreign Minister Chrystia Freeland, making the announcement at a steel plant in Hamilton, Ontario flanked by brawny workers in yellow hardhats.
"We will not escalate and we will not back down," she added, while urging Washington to reconsider its attack on the Canadian economy, and noting that the response was Ottawa's toughest trade action since World War II.
The list of some 250 US goods subject to the Canadian duties aim to apply maximum pressure on Trump supporters in swing states in upcoming US midterm elections in November.
The tariff targets include Florida orange juice, Wisconsin toilet paper, North Carolina gherkins, which are labour intensive to produce.