Answer:
"The outcome of the Mexican-American War supported Polk's presidential promises by leading to the acquisition of significant territory, including California, New Mexico, and other southwestern lands, which fulfilled his pledge to expand the United States' territory to the Pacific Ocean."
Step-by-step explanation:
During his presidency, Polk had made several promises related to territorial expansion and manifest destiny, which was the belief that it was America's destiny to expand across the continent. The Mexican-American War resulted in the signing of the Treaty of Guadalupe Hidalgo in 1848. This treaty ended the war and ceded a substantial amount of territory to the United States, essentially achieving Polk's goal of expanding the nation to the Pacific Ocean. This outcome supported his promises of territorial expansion