Stephen W. Kearny was a prominent American military officer during the 19th century, best known for his role in the Mexican-American War. Born on August 30, 1794, in New York, he graduated from the United States Military Academy and served in various military campaigns. Kearny played a crucial role in the capture of Santa Fe in 1846 and later led forces into California. His leadership and strategic skills significantly contributed to the expansion of the United States' territory during this period. Kearny passed away on October 31, 1848, leaving a legacy as a key figure in American military history.