Area which the u. s. acquired in 1853, effectively completing its manifest destiny?

Arizona

Explanation:

According to the Destiny Manifest, the spread of civilization was something important and desired by God. In the 19th century, the United States began to be shaped. Meanwhile, another point was under discussion: the idea that freedom was being spread across the incorporated land. This idea of spreading freedom was first used by President Andrew Jackson to justify the inclusion of Texas in the Union, and later to take over the states of California, New Mexico, Arizona, Nevada, Utah, and parts of Colorado, Kansas, and Oklahoma in the War against Mexico that lasted from 1846 to 1848.

51% were unhappy, i think .   ; )