U.S. President Donald Trump's tariff decisions since he took office in January 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,

That leverage came from the singular importance of the US market to the global economy. Trump’s personal belief in the utility of tariffs — and willingness to let them go into place and then, if necessary, escalate to shut down any retaliatory efforts — only served to enhance that reality.

Many smaller countries’ exports have faced 10 percent tariffs since the president first announced, then suspended, an initial wave of policies in April. Others have staved off eye-watering rates after brokering deals with the United States that set their tariffs generally between 15 and 20 percent.