U.S. President Donald Trump's tariff decisions since he took office on January 20 have shocked financial markets and sent a wave of uncertainty through the global economy. Here is a timeline of the major developments: February 1 - Trump imposes 25% tariffs on Mexican and most Canadian imports and 10% on goods from China,

Stock markets declined after the president’s early-morning threats of 25 percent import taxes on iPhones and 50 percent on goods from Europe.

President Donald Trump’s moves Friday to reignite his global trade war laid bare the administration’s bubbling frustration with resistance from both corporations and foreign countries unwilling to rapidly bow to U.