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The purchase of French land in 1803 issued by Napoleon Bonaparte due to France no longer wanting Louisiana and wanting to focus on Europe instead 

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In August of 1845 John L O'Sullivan published a newspaper

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Westward Expansion & Manifest Destiny - LOA 2020

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President James K. Polk sent troops to Texas to protect the border. Soon Troops from the U.S and Mexico were attacking each other . On May 13, 1846 the United States declared war on Mexico

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President James K. Polk sent troops to Texas to protect the border. Soon Troops from the U.S and Mexico were attacking each other . On May 13, 1846 the United States declared war on Mexico

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America obtained Arizona, New Mexico, Nevada and California

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The first talk of a transcontinental railroad started around 1830.

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In 1819, after years of negotiations, Secretary of State John Quincy Adams was able to convince Spain and cede Spain with the signing of the Florida Purchase Treaty, which  put Florida into U.S. hands with a cost of $5 million dollars and General Andrew Jackson, was appointed military governor. Florida was admitted as a U.S. territory in 1822 and was admitted into the Union as a slave state in 1845.

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Fur trades became popular in the Oregon County after Britain and the U.S agreed to share (Northwest U.S and modern Canada ) which was know as Oregon County

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Hoping to gain more land from Texas (which was then Northern Mexico) Stephen Austin led American settlers into Texas. Upon that, Mexico closed Texas borders to settlers due to disobedience of Mexican laws. Texas declared independence from Mexico which lead to the Battle of San Jacinto then the Texas Revolution finally ended. After winning independence from Mexico, Texas asked the Union to be admitted as a state. The North voted no because they believed that admitting another slave state into the union would cause an imbalance of power between slave states and non-slave states in congress. Many also feared that a war would arise with Mexico because Mexico did not fully acknowledge Texas as independent. Texas became its own country known as the Lone star republic until 1854 when it threatened to become a colony of Britain congress finally admitted Texas as the 28th state on December 29, 1854

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Erie Canal at 200: How a ditch transformed New York into the Empire State