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following the 1803 Louisiana Purchase, Congress was compelled to establish a policy to guide the expansion of slavery into the new western territory.  Missouri’s application for statehood as a slave state sparked a bitter national debate.  In addition to the deeper moral issue posed by the growth of slavery, the addition of pro-slavery Missouri legislators would give the pro-slavery faction a Congressional majority.

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The major roles that in this events were the Political Figures which included  Thomas Jefferson and James madison who send the two millitary men William Clark and Meriwether Lewis on an expedition to look for a source of water that connects to the Missouri River.

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The ratification of the Louisiana Purchase treaty by the Senate on October 20, 1803, doubled the size of the United States and opened up the continent to its westward expansion.

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The Louisiana Purchase was the Purchase of the Louisiana territory during 1803, when the US  followed by President Jefferson and the constitution bought back the territory from Napoleon at the price of $15 millions .

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This was an exploration of new land acquired by the US in 1803 and was led by military men named William Clark and Meriwether Lewis. Tomas Jefferson sent them on this expedition because he wanted them to find an all water source going across north america.