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While Thomas Jeffferson was president of the United States in 1803, he purchased a huge piece of land from the French. This purschase doubled the size of the United States.
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The Britsh Cession was also known as The Red River Cession or The Treaty of 1818. The Britsh and United States establiished the boundry between the United States and Canada.
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This treaty was also refered to as The Florida Treaty, it fixed the United State's western boundry.
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While Polk was president, Texas asked to become part of the United States. Right after Texas became part of the United Staes, Mexico declared war on the United States.
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Mexico agreed to give up Texas to the United States, which ended the Mexican-American War. This land included all of the present-day states of California, Nevada, Utah and also parts of Arizona, Colorado, New Mexico, Utah, and Wyoming.
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The Gadsen Pruchase was an agreement bewteen the United States and Mexico. The United States paid Mexico $10 million dollars for a portion of Mexico, which later becomes Arizona and New Mexico.
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The southwest of the terriory became part of the Union as the state of Oregon. The remaining land is parts of present day Washington, Idaho, and portions of Montana.
