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The Treaty of Paris ended the Revolutionary War and formally established the boundaries of the United States
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The United States signed an agreement to purchase the Louisiana territory from the French for $15 Million dollars. This effectively doubled the size of the United States
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First aquiring West Florida in 1810 the United States aquired the remainder of the Florida Territory from Spain 1819
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The United States annexed the Republic of Texas in 1845 after much debate and a threat of war by Mexico
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An agreement between the United States and the Untied Kingdom that set the North Eastern boundaries at the 49th Parrallel, a lin of latitude
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On February 2nd 1848 the United States and Mexico signed the Treaty of Guadalupe Hidalgo. This treaty, which ended the Mexican-American War ceded most of the territory that makes up the modern South Western United States. Further territory was purchased in 1853 which is commonly known as the Gadsden Purchase
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The Senate Approved the Bill which would allow the United States to purchase the Alaskan Territroy, then called Russian America for 7.2 million dollars, a little less than 2 cents an acre
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After a Coup toppled the Kingdom of Hawaii in 1898 the Republic of Hawaii offered and was recognized as a territory of the United States 1900
