After months of uncertainty and waiting for concessions, offering temporary exemptions, the Trump administration announced tariffs will go into effect on steel and aluminium imported from the European Union, Canada and Mexico. A tariff of 10% on aluminium and 25% on steel goes into effect on May 31st, 2018. The tariffs affect about half of the imports of steel and aluminium into the U.S. and are intended to keep promises to protect American industry made by president Trump during his election campaign.
Mexico and the European Union are imposing retaliatory tariffs. The European Union will impose tariffs on $3 billion of American goods in retaliation.