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Lewis and Clark were the leaders of the Corps of discovery. They traveled on the missouri river all the way west. This is a key event because this started making maps of all the land earned. This lead to the civil war because the land developing started to be slave states.

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Charles Sumner agreed with the free states and wanted to ban slavery, but Preston brooks disagreed with him and started beating him with a cane. This is a key event because it shows fighting. This went to civil war because of the fighting over slavery

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Thomas Jefferson bought the louisiana purchase and sent off lewis and Clark to go explore all along the missouri river. Because he bought this land slavery has been separated into north and south. This is a key event because settlers are moving to different areas for what their side is. This lead to the civil war because the splitting of slavery makes the people want the other side to lose so they fight.

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JK Polk was the 11th president of the united states of america. He gained the most land out of any president in history, over 1 million square miles of land. This is a key event because gaining all of this land caused lots of arguments over slavery. This lead to the civil war because all of the fighting over slavery in every state eventually just made a war.

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The government told everyone that kansas and nebraska were going to be a free or slave state dole to popular sovereignty. Two governments formed in nebraska and they were fighting for their side. This is a key event because settlers from everywhere were fighting each other because they want their side for that state. This lead to the civil war because different sides were fighting over slavery.

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USA negotiated with Mexico to buy a small piece of land. This is a key event because it became a slave state and northern settlers wanted it to end. This lead to the civil war settlers were arguing from california to the gadsden purchase

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America negotiated with britain tol divide the land. This is a key event because they split the land before they could get it all. This lead to the civil war because the land had to be decided for a free or slave state.

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As part of the Compromise of 1850, the Fugitive Slave Act was amended and the slave trade in Washington, D.C., was abolished. Furthermore, California entered the Union as a free state and popular sovereignty was used to see if utah was a free or slave state. This is a key event because people were able to vote for the slave or free state. This leads to the civil war because there were a lot of fights over the land for a free or enslaved state.

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This treaty, signed on February 2, 1848, ended the war between the United States and Mexico. ... By its terms, Mexico ceded 55 percent of its territory, including parts of present-day Arizona, California, New Mexico, Texas, Colorado, Nevada, and Utah, to the United States. THis is a key event because there were a lot of states added to the union and they had to figure out if it was going to be a free or enslaved state. This will go to the civil war because there will be arguments over a free or slave state.

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The United States and Great Britain signed the Treaty of Oregon on June 15, 1846, ending 28 years of joint occupancy of the Pacific Northwest. The treaty established the 49th parallel as the border between the two countries. This is a key event because this made the boarder of 2 countries. this lead to the civil war because they made it to the western boarder and it was admitted a free state.

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Manifest Destiny, a phrase coined in 1845, is the idea that the United States is destined by God, its advocates believed to expand its dominion and spread democracy and capitalism across the entire North American continent. This is a key event because everyone believed that moving west was bound to happen so everyone started moving west. This lead to the civil war because fights and wars started with mexico and were debating if slavery was allowed.

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On December 29, 1845, Texas entered the United States as a slave state, broadening the irrepressible differences in the United States over the issue of slavery and setting off the Mexican-American War. This is a key event because slavery kept moving west when north settlers want to end it. This lead to the civil war because the slave settlers kept expanding west and slaves kept getting imported.

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The government drew a line above arkansas and below missouri. In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state. This is a key event because Missouri was above the line as a slave state and that is not fair for them. This started much violence leading up to the civil war

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In 1819, after years of negotiations, Secretary of State John Quincy Adams achieved a diplomatic coup with the signing of the Florida Purchase Treaty, which officially put Florida into U.S. hands at no cost beyond the U.S. assumption of some $5 million of claims by U.S. citizens against Spain. This is a key event because Florida became a slave state. Many settlers disagreed with all of the slavery going on and wanted it to stop.

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Importation of Slaves comes into effect. Importing slaves became banned this is also the earliest day under the United States Constitution that an amendment can be made restricting slavery. This is a key event because this is how the southern people got their slaves. This leads to the civil war because settlers were fighting over the land the slavery goes to.

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The Corps of Discovery explored in the Missouri river in a 55-foot keelboat to begin the westward journey up the Missouri River. 41-men crew of volunteers, soldiers and one African American slave, is Patrick Gass, a carpenter from Pennsylvania. This is a key event because this started trading with natives and exploring the new land too. This leads to the civil war because it started westward expansion of slavery.

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The Louisiana Purchase was the purchase to the western half of the Mississippi River. US bought the land from France. This is a key event because many settlers wanted to move west and keep adding slavery but many settlers that didn't want slavery moved west too to end it. It leads to the civil war because the north and south were arguing.

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Cotton gin was created by American inventor Eli Whitney in 1793 and used in 1794. Whitney's gin used a combination of a wire screen and small wire hooks to pull the cotton through, while brushes moved loose cotton lint to prevent jams. This is a key event because slavery was going to be used a lot to pick the cotton with the new invention. This will lead to the civil war because the southern side wanted slavery but the northern side didn't

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The Northwest Ordinance established a government for the Northwest Territory, and were making the new states the same as the 13 colonies, free.This is a key event because the Northern people did not except slavery where they were. This lead to the civil war because the north and south started arguing over slavery.

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A treaty between the United States and the Britain is signed in Paris, ending the war and giving the United States independence from Great Britain. This is a key event in the 19th century because The Corps of discovery started exploring the new land. It lead to the civil war because people started westward expansion and started doing more slavery.