President Donald Trump officially increased tariffs on all steel and aluminum imports to 25% on Wednesday, promising that the taxes would help create U.S. factory jobs at a time when his seesawing tariff threats are jolting the stock market and raising fears of an economic slowdown.

Canada and Mexico A 25% import tariff on goods from Mexico and Canada took effect March 4, with an exception for energy products and potash, which received a 10% tariff. The next day, the Trump administration suspended those tariffs until April 2 for autos eligible for duty-free trade under the U.