President Trump’s ‘America First’ approach has relied on slapping tariffs on countries, such as China and Mexico, which have led to current trade wars. What is a tariff and how do they work? We explain. Just the FAQs, USA TODAY

The Dow added 400 points in Tuesday afternoon trading after the Trump administration postponed planned tariffs on China, alleviating traders’ fears that the trade war between the two countries was escalating.

The Dow Jones Industrial Average added 1.56%, or 403 points, to 26,301, while the S&P 500 rose 1.6%, or 46 points, to 2,929. The Nasdaq composite led the gains, jumping 149 points,

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