Long-threatened tariffs from U.S. President Donald Trump have plunged the country into a trade war abroad — all while on-again, off-again new levies continue to escalate uncertainty.

Increased tariffs on all U.S. steel and aluminium imports took effect on Wednesday, as Trump stepped up his campaign to reorder global trade in favour of the United States. Europe and Canada swiftly retaliated.

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.