As President Trump’s global tariffs against steel and aluminum took effect, the European Union said it would impose up to $28 billion in levies on U.S. goods. The latest escalations added to the trade turmoil unsettling the world economy.

As President Trump’s global tariffs against steel and aluminum took effect, the European Union said it would impose up to $28 billion in levies on U.S. goods. The latest escalations added to the trade turmoil unsettling the world economy.