Who?

James K. Polk (1795-1849) was the eleventh president of the United States. His name is perhaps most closely associated with Manifest Destiny, as the term was coined by a fellow Democrat in 1843, the year before he began his presidency. Manifest Destiny—the belief that Americans were destined by God to conquer the continent to the Pacific Ocean—soon came to embody the governing philosophy of the Polk administration and its ardently expansionist aims.

General Winfield In the Mexican-American War, Scott commanded the southern prong of attack. With the help of the Navy, it did not take long for him to conquer the Mexican port of Veracruz; his troops marched toward Mexico City and took Cerro Gordo in April, stalled for several months in Puebla, but then advanced victoriously through battles at Contreras and Churubusco

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General Stephen W. Kearny (1794-1848) was commander of the Army of the West during the Mexican-American War.