The S&P 500 dropped 0.50% on Friday, closing at 6,040.53, as reports confirmed that President Donald Trump’s latest tariffs on key U.S. trading partners would take effect on Saturday.

The Dow Jones Industrial Average fell 337.47 points (-0.75%), closing at 44,544.66, weighed down by Chevron (NYSE:CVX).
The Nasdaq Composite, heavily skewed toward tech stocks, slipped 0.28% to 19,627.44.
Despite a steep 3.07% drop on Monday, the Nasdaq ended the week down 1.6%, while the S&P 500 lost 1%. The Dow, however, gained 0.3% over the week.
Nvidia (NASDAQ:NVDA), which tumbled nearly 17% on Monday, closed the week down 16%.

January’s Volatile Market Ends in Gains
Despite turbulence, all three major indexes finished January higher:? S&P 500: +2.7%? Nasdaq: +1.6%? Dow: +4.7%
Trump’s Tariffs Ignite a New Trade War
On Saturday, Trump officially announced sweeping tariffs on imports from Mexico, Canada, and China.

Mexico and Canada are hit with a 25% import tariff, while China faces a 10% duty.
The stated reason: Curb fentanyl imports & illegal immigration.
Immediate retaliation:

Mexico & Canada vowed countermeasures.
China pledged action at the WTO and hinted at “other countermeasures.”

Market Impact: What’s Next?
The market is closely watching global trade tensions, which could fuel inflationary pressures and supply chain disruptions.
To track these risks, check out:

Earnings Calendar API – Monitor how companies are adjusting to trade tensions.
Sector P/E Ratio API – Identify valuation shifts across industries.

With trade tensions escalating, markets could see further downside risk in the coming weeks.