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The Territory of Louisiana was continuously ceded between France and Spain, then the US decided to stop the feud and was able to purchase the territory for a bargain.
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The Treaty of 1818 ended a dispute between the US, Britain, and Ireland. It also gave the US a lot of rights.
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The Adams-Onis Treaty was a treaty that gave the US Florida and settled the dispute between the two countries.
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The Texas Annexation was a territory that was added to the Union as the 28th State.
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The Mexican Cession was a treaty between the US and Mexico and the US bought the land off of Mexico for $15 million.
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The Gadsden Purchase was a treaty on where the US paid Mexico $10 million for an area that would later become part of Arizona and New Mexico.
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The Oregon Territory was an organized independent territory that lasted from August 14 1858 to February 14 1859. That is when the Oregon Territory joined the Union.
