The Trump administration touts tariffs as part of a wider set of "America First economic policies," which have "sparked trillions of dollars in new investment in U.S. manufacturing, technology, and infrastructure," according to the White House's website.

Trump has justified tariffs on goods from Canada, the top U.S. export market, by accusing it of failing to stop the cross-border flow of fentanyl, even though U.S. government data shows Canada accounts for only 1% of the fentanyl that enters the United States.

U.S. President Donald Trump’s trade deal with Japan has sparked fresh optimism that the global economy will manage to avoid getting hit with extremely elevated tariffs, even as many U.S. trading partners still don’t have agreements.