Section 232 of the U.S. Trade Expansion Act of 1962 allows the United States to restrict imports when they are determined to threaten U.S. national security. These measures are commonly referred to as sectoral tariffs because they apply to specific industries and product groups.
Section 232 tariffs currently affect Canadian exports in sectors including steel, aluminum, copper, automobiles and trucks and their parts, lumber and wood products, buses, and certain other products. Tariff rates, exemptions and treatment vary considerably by sector and product.
Official U.S. source: U.S. Department of Commerce, Section 232 Investigations →
Canadian context: Government of Canada, Understanding CUSMA Compliance →
