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The United States bought the Louisiana Purchase from France for $15 million dollars.
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The treaty of 1818 was signed buy the US and The United Kingdom to give us the bordered land between them. This also resolved boundary issues.
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The United States buys Florida from Spain.
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United States officially claims Texas as the 28th state. This later leads to the Mexican-American War.
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The Treaty of Guadalupe-Hidalgo gave about half of the land from the Mexican Republic to The United States. This costed the US about $15 million dollars.
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The southwestern portion of the territory was added to the union as a state.
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United States paid Mexico $10 million dollars for what is now parts of Arizona and New Mexico.