US core inflation rose by only 0.1% from February to March 2025, marking the least increase in nine months, while the general consumer price index decreased by 0.1%, the first drop in nearly five years. Annually, core CPI experienced a 2.8% increase, the smallest rise in nearly four years. Notable contributors to the slowdown included reduced prices for energy, used cars, and airfares. This inflation relief occurs amidst new expansive tariffs imposed by the US, which could soon pressure consumer prices further.