President Donald Trump on Thursday imposed once unthinkably high U.S. taxes on imports from dozens of countries, part of his campaign to turn one of the world's most open economies into a fortress bristling with barriers to trade.

The sweeping tariffs impose higher import taxes on goods from more than 60 countries. Here's what you need to know.

The U.S. has begun officially levying higher taxes on imports from dozens of countries Thursday, four months after President Donald Trump first announced plans to impose tariffs on most of the world while seeking new trade agreements across the board.