The Gadsden Purchase was 29,670 square miles that was added to the US in 1853/1854.
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50 years. The Louisiana Purchase was in 1803. And the Gadsden Purchase was in 1853. Many political and US business leaders believed the transcontinental railroad would begin in New Orleans and reach California. The Gadsden Purchase offered land by which the rail link would travel.
The objections surrounding the Gadsden Purchase compared to the Louisiana Purchase were intense in some parts of the US. Many people compared it to Jefferson's Louisiana Purchase. The former cost 53 cents per acre which was 18 times more expensive than the latter. To top it off, the size of the Gadsden deal was 27 times smaller.
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The Louisiana purchase was a land deal between the United States and France, in which the U.S. acquired approximately 827,000 square miles of land west of the Mississippi River for $15 million dollars.
349.4 square miles.