Trump's tariff plan would affect products from Canada, Mexico, and China. Here's what to know about tariffs, who pays them, and how they work.

The president-elect’s opening salvo in trade and border talks with the United States’ neighbors is casting a harsh light on the North American alliance.

President-elect Trump has put the country’s top three trading partners on notice less than two months before he takes office. The former president threatened Monday to impose steep 25 percent tariffs on all goods from Canada and Mexico — two key U.