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,

Trump’s renewed tariff threats hit some of the closest U.S. allies. Japanese Prime Minister Shigeru Ishiba described the developments as “deeply regrettable.”

President Trump on Tuesday vowed to not back down on his new Aug. 1 deadline on tariffs — but Wall Street isn’t convinced.