テキサス併合
In July 1845, the New York newspaper editor John L. O’Sullivan coined the phrase, "Manifest Destiny," as the "design of Providence" supporting the territorial expansion of the United States. [[Manifest destiny|Manifest Destiny]] had serious consequences for Native Americans, since continental expansion for the United States took place at the cost of their occupied land. Manifest Destiny was a justification for expansion and westward movement, or, in some interpretations, an ideology or doctrine that helped to promote the progress of civilization. Advocates of Manifest Destiny believed that expansion was not only good, but that it was obvious and certain. The term was first used primarily by [[Jacksonian democracy|Jacksonian Democrats]] in the 1840s to promote the annexation of much of what is now the [[Western United States]] (the [[Oregon Territory]], the [[Texas annexation|Texas Annexation]], and the [[Mexican Cession]]).