<h1>Tariffs on imports risk concentrated harm to export dependent US metros, disrupting supply chains and threatening jobs.</h1> The article assesses how elevated US import tariffs on Canadian goods and Canada's retaliatory duties would disproportionately harm certain US metropolitan areas whose exports to Canada form large shares of local economic output. San Antonio and Detroit are identified as most exposed, with other auto, aerospace and energy hubs and politically significant Midwestern and Southern metros also vulnerable. The transmission mechanisms are reduced external demand, disrupted supply chains and potential job losses, and the analysis notes some tariff measures have been delayed though scheduled to take fuller effect.