President Donald Trumps expansive new tariff regime reverses a decades-long global trend of lower trade barriers, will likely raise prices for U.S. consumers, and threatens to sharply slow the economy this year. The White House is gambling that other countries will also suffer enough pain that they will open up their economies to more American exports. Or, the White House hopes, more companies will bring more production to the United States. But a key question will be how Americans react to the tariffs. If voters could turn against the duties, that could make it harder to keep them for the length of time needed to encourage companies to return to the U.S.