How Did Manifest Destiny Affect Westward Expansion

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In 1845, when John L. O’Sullivan used the term “manifest destiny” to describe America’s given right to expand west, he did not know what impact it would have on the United States. Manifest destiny influenced the expansion and settlement of America, as well as the culture and economy. As the United States expanded west in the 1800s, wars and treaties impacted the growth of the nation. War and treaties, specifically the Mexican-American War and the Oregon Treaty of 1846, impacted the westward expansion of the United States. At the end of the Mexican-American War, which occurred from 1846 to 1848, the U.S. and Mexico signed the Treaty of Guadalupe Hidalgo. The purpose of the treaty was to give the U.S. the land they won from war, which included