WASHINGTON — The tariffs planned by President Donald Trump on Friday touched off a feverish bout of activity among trade partners as key details remained unclear and nations didn't know the taxes their goods could face — keeping an element of surprise to an event long hyped by the U.S. leader.

Just hours before the deadline, Trump on Thursday said he would enter a 90-day negotiating period with Mexico over trade as 25% tariff rates stay in place, providing a bit of clarity to a massive rewiring of the global economy that will require the president to sign a new executive order.

Trump posted on his Truth Social platform that his phone conversation with Mexican leader Claudia Sheinbaum was “very successful in that, more and more, we are getting to know and understand each other.”

The R

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