In November 2011, Groom published his latest history, Kearny's March: The Epic Creation of the American West, 1846–1847. Groom describes how Brigadier General Stephen W. Kearny's quest for westward adventure coincided with the expansionist desires of U.S. President James K. Polk. The book opens in mid-summer 1846, in the period of the Texas Annexation, the Mexican–American War, and brewing issues related to the American Civil War fifteen years in the future. Groom weaves into Kearny's March mountain man Kit Carson, Brigham Young and his Mormon followers, and members of the Donner party.
