An article summarized by Quartz:

Canada has imposed counter-tariffs on $27.6 billion worth of U.S. goods, with rates ranging from 15% to 50% across products including steel, dairy, appliances, agricultural equipment, electronics, clothing and furniture. The tariffs took effect at 12:01 a.m. Tuesday and apply only to goods originating in the United States. Steel, aluminum and iron products face the highest 50% rate, while existing Canadian tariffs on U.S. automobiles remain in place.

Ottawa says the tariffs are a “dollar-for-dollar” response to new U.S. tariffs on Canadian exports, designed to protect Canadian workers and producers from American competition. Goods already in transit when the tariffs took effect are exempt, and Canada has also announced a $7.5 billion support package for businesses and workers affected by the trade measures.

The escalation follows the collapse of U.S.-Canada trade negotiations in late August. The U.S. subsequently imposed a 50% tariff on about $20 billion of Canadian goods under Section 338 of the 1930 Tariff Act. Economists warn that smaller businesses and industries concentrated in the targeted categories could feel the biggest impact, although the affected products represent a relatively small portion of overall bilateral trade.

For the article: https://qz.com/canada-retaliatory-tariffs-us-goods-trade-war-090826