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The 13 colonies was added to the United States to include land all the way to the Pacific Ocean. When the British began establishing colonies in America, they declared their independence from Britain, becoming part of the United States.

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The United States expanded through economic, political, and military means. The Second Continental Congress declared the independence of the colonies, making them the "United States." This was accomplished during the American revolution.

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The treaty of 1818 became part of the United States because of the negotiating done by Albert Gallatin, ambassador of France, as well as Richard Rush which was minister to the UK. The treaty of 1818 established the boundaries between U.S and Canada.

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The Texas Annexation was brought to life due to the Texas president Jones calling for the annexation as well as a constitution. It was accepted and on March 1, 1845, Texas was annexed to the United States. This was done to permit Texas to retain title to its public lands.

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The Mexican Cession. was brought about because Mexico ceded to the United states in the Treaty of Guadalupe in 1848 after Mexican-American War. This added the control f California, which was especially appealing and guaranteed American access yo the Pacific Ocean. This territory was bought by the US, by Mexico in exchange for $15 million.

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In 1846, the Oregon treaty was signed between the US and Britain to settle the boundary dispute. President Polk, who was in charge during this time, added more territory to the US than any other president.

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The Gasden Purchase was given to the US based off a treaty by Mexico to the United States. This was a traety that costed $10 million, later becoming Arizona and New Mexico.

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Florida was acquired by the United States when Spain ceded East Florida to the US and renounced all claim to West Florida.

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The Louisiana Purchase is one of the biggest assets of land the US has acquired. This land was signed over to the US by France on April 30, 1803. This was due to Jefferson wanting to double the size of the US in order to provide future generations of new farmland.