(CNN) โ President Donald Trump announced he will impose an additional 100% tariff on goods from China, on top of the 30% tariffs already in effect, starting November 1 or sooner. The threat is a massive escalation after months of a trade truce between the two nations.
โThe United States of America will impose a Tariff of 100% on China, over and above any Tariff that they are currently paying,โ Trump said in a post on Truth Social Friday afternoon. โAlso on November 1st, we will impose Export Controls on any and all critical software.โ
Trumpโs announcement is tied to Beijingย ramping upย export controls on its critical rare earths, which are needed to produce many electronics. As a result, Trump appeared toย call off a meetingย with Chinese President Xi Jinping that was scheduled for later this month in South Korea.
Trumpโs initial message Friday, delivered via a Truth Social post, in which he threatened โmassiveโ new tariffs, was ill received by investors on Friday as fears of a spring dรฉjร vu, when tariffs on Chinese goods soared to a stunning 145%, set in. Markets closed sharply lower on Friday after Trumpโs initial comments, with the Dow falling by 878 points, or 1.9%. The S&P 500 was down 2.7%, and the tech-heavy Nasdaq tumbled 3.5%.
While Trump doesnโt always act on his threats, investors, consumers and businesses still have reason to worry.

The two largest economies depend on each other
The United States and China are the worldโs two largest economies. Although Mexico has recently replaced China as the top source of foreign goods shipped to the United States, America depends on China for hundreds of billions of dollarsโ worth of goods. Meanwhile, China is one of the top export markets for America.
In particular, electronics, apparel and furniture are among the top goods the United States receives from China. Trump has pushed CEOs, especially in tech, to move production to the United States, but heโsย softened his approachย in recent months as business leaders have satisfied the president with announcements of hundreds of billions of dollars in investments in US manufacturing โ even if they continue to make the bulk of their products overseas.
Shortly after imposing minimum 145% tariffs on Chinese goods โ an effective embargo on trade, Trumpย issued an exemption for electronics, making them subject to 20% tariffs instead. The move was, in many ways, an acknowledgment that the Trump administration understood the pain he was inflicting on the US economy through his sky-high tariffs.
Then, in May, US and Chinese officials further established the interdependence of trade by agreeing to lower tariffs on one another. China brought levies on American exports down to 10% from 125%, and the United States brought rates down to 30% from 145%.
Both countriesโ stock markets rallied as a result.
It was only a matter of time
Trump on Friday claimed trade hostility from China โcame out of nowhere.โ But in reality, itโs been bubbling up for months.
For the United States, a critical part of trade agreements has been to ensure China will increase its supply of rare earth magnets. Yet despite several apparent breakthroughs, Trump has in recent months repeatedly accused China of violating the terms.
Trump first responded by putting restrictions on sales of American technologies to China, including a key Nvidia AI chip. Many of these restrictions were later lifted.
Then came the Trump administrationโs announcement that it would soon impose fees on goods transported on Chinese-owned or -operated ships. China countered with a similar plan on American ships that took effect Friday.
In short: Trump has already demonstrated thereโs no limit to how high heโll go with tariffs on China, and Xi has shown no mercy in how he chooses to retaliate.
But Trumpโs ability to continue to impose tariffs on a whim could soon end, pending the verdict in a landmark case kicking off in the Supreme Court next month. Xi, however, faces no such constraints.
