Long-threatened tariffs from U.S. President Donald Trump have plunged the country into a trade war abroad — all while on-again, off-again new levies continue to escalate uncertainty.

He's been president of the United States for less than two months, but Donald Trump has already rolled out hefty import taxes on his biggest trading partners. Here's a timeline of the trade war that started during his first term in office.

On the very day he was inaugurated, Trump announced plans to impose 25% tariffs on Mexico and Canada. First, they were postponed for 30 days. Then, they went into effect on March 4, only for Trump to decide a couple of days later to halt tariffs on many imports from Canada and Mexico for one month.