Trump Imposes 25% Steel, 10% Aluminum Tariffs

Trump signs proclamations imposing 25% tariffs on steel imports and 10% on aluminum imports, citing national security concerns under Section 232. Canada, Mexico, and the EU are initially exempt, then hit with tariffs in June when negotiations stall. Trading partners retaliate with targeted tariffs on US exports. The move triggers the first major trade war of Trump's first term.