John L. O'Sullivan gave the movement it's name
He was a newspaper editor who came up with the idea of manifest destiny
Manifest Destiny which was an idea brought up during the time that God wanted them to expand westward
Manifest Destiny was the belief that the U.S. was meant to expand over all the land in North America.
The idea of Manifest Destiny was popularized during the presidency of James K. Polk, who served from 1845 to 1849. Although the term itself was coined by journalist John L. O'Sullivan in 1845, Polk's administration actively promoted the belief that the United States was destined to expand across the North American continent. This concept justified westward expansion and was a driving force behind various policies and conflicts, including the Mexican-American War.
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The reason the people of the United States felt like it was their right and duty to spread across the continent of North America was based on one idea called Manifest Destiny, which has the famous quote: "From sea to shining sea." Manifest Destiny was accomplished through the Monroe Doctrine, if you wish to learn more go to Wikipedia and look up the Monroe Doctrine or Manifest Destiny. I hope this answer helped.
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who came up with the idea of NAFTA
The effects were that wealthy man got more opportunity's and it opened up more doors for the poor but it didn't go over the wealthy mean.
The Missouri Compromise's latitudinal division of the United States had become a barrier to the spirit of Manifest Destiny due to sectional hostilities. Texas, tried to get annexed for nine years, but had failed due to it allowing slaves in the state. With new western territories opening up, southerners in particular believed the compromise was holding back their vision of Manifest Destiny.
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Population Growth