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Manifest Destiny was a phrase that expressed the idea that the United States was destined to expand from the Atlantic seaboard to the Pacific Ocean. Advocates of Manifest Destiny believed that expansion was not good, but that it was obvious ("manifest") and certain ("destiny"). It was originally a political catch phrase or slogan used by Democrats in the 1845-1855 period, and rejected by Whigs and Republicans of that era. Manifest Destiny was an explanation or justification for American expansion, or, in some interpretations, an ideology or doctrine which helped to promote the process. The phrase "Manifest Destiny" was first used primarily by Jackson Democrats after 1845 to promote the annexation of much of what is now the Western United States including the Texas Annexation and the Mexican Cession from Mexico, and the Oregon Territory to which both Great Britain and the U.S. laid claim. Not all Americans who believed that the United States was a divinely favored nation thought that it ought to expand. Whigs especially argued that the "mission" of the United States was only to serve as virtuous example to the rest of the world. If the United States was successful as a shining "city on a hill," people in other countries would seek to establish their own democratic republics. Also, the concept had serious consequences for American Indians. The United States purchased land rights by treaty from the Indian tribes. National policy was that Indians had to become "civilized" and abandon hunting and become farmers. Advocates of "civilization" programs believed that the process would greatly reduce the amount of land needed by the Indians, thereby making more land available for purchase by white Americans.