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The Lousiana Purchase was bought by President Thomas Jefferson from France.
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A Spainish territory taken over by the USA in 1819.
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Texas had just won it's independence from Mexico. For 9 years, Texas stood as a nation. Soon, Texans wanted to join the USA. Congress passed its statehood in 1845
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James Polk, the current president of the time, promised to take The Oregon Country. The British agreed to have a border of U.S. territory at latitude 49 degrees north.
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Mexico wanted Texas back and the USA wanted to settle on other Mexican lands such as California. After a war with Mexico,the Mexican government ceded a huge piece of land and gave it to the USA.
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A guy named James Gadsden negotiated an agreement with Mexico for a patch of land that is part of present-day Arizona and New Mexico.