How did the Treaty of Guadalupe Hidalgo finally achieve the idea of Manifest Destiny? A. It ended the Mexican American War and ceded land to the United States that gave it access to the Pacific Ocean. B. It ended the War of 1812 and ceded land to the United States that gave it access to the Colorado River. C. It moved all Native Americans from the southwestern United States to reservations in the midwest. D. It authorized the Lewis and Clark expedition to explore the Louisiana Territory.