The American forces during the Mexican-American War (1846-1848) were led by General Zachary Taylor and later by General Winfield Scott. Taylor initially achieved significant victories at battles such as Palo Alto and Buena Vista, which established his reputation. Scott, overseeing the main thrust into Mexico, led the successful campaign to capture Mexico City in September 1847. Both generals played crucial roles in the U.S. victory, which resulted in significant territorial gains for the United States, including present-day California, Arizona, New Mexico, and Texas, reshaping the country's geographic and political landscape.