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1787- It proposed that 3-5 new states would be created from the new territory. The Northwest Ordinance banned slavery in the Northwest Territory. Pro-slavery individuals in the South were willing to go along with this in hope that these new states would be populated by settlers from the South. This event led to the Civil War because when the Northwest Ordinance was written in 1787, some Southerners threatened to leave the Union if slavery was threatened which created more division in the country.

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1793- The cotton gin was an invention that cleaned cotton of its seeds, and it made the production of cotton skyrocket. Since there was a lot of cotton being produced, plantation owners needed enslaved people to get the cotton for them. This was a problem because it increased the need for slave labor in the South. This led to the civil war because the population of enslaved people was increasing at high rates, which was exactly what the North wanted to avoid.

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1800- This election is when Thomas Jefferson was elected as president. This election is important because Thomas Jefferson is who bought the Louisiana Purchase, sent Lewis and Clark on their exploration, which both contributed to the Civil War. This event led to the Civil War because if that land wasn't bought or explored, it wouldn't have been fought over for free land or slavery land.

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1803- A land deal between U.S. and France in which Thomas Jefferson acquired the Louisiana Territory from French leader, Napolean , which doubled the size of the United States. This event led to the Civil War because without this territory , the North and the South wouldn't have the land to fight over for pro and anti-slavery land.

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1804-1806: Captain Meriweather Lewis and Lieutenant William Clark were chosen by Thomas Jefferson to lead the expedition to explore the newly purchased Louisiana Territory. They looked for and recorded a passage via water from the Missouri River to the Pacific Ocean. There wasn't a direct passage through water, but they discovered new plants and animals and reported it back to Jefferson. This event led to the civil war because without the exploration of this area, the North and South wouldn't have anything to fight over.

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1808- Due to the Slave Trade Clause, Congress couldn't ban the Trans Atlantic Slave Trade until 1807. The banning of the Trans Atlantic Slave Trade made it so that the trade of enslaved people across the Atlantic Ocean was no longer allowed. However, it didn't ban slavery in the United States. At this time, there were more than 4 million enslaved people in the South, so the slave population at that point, was self sustained. This event led to the Civil War because although it stopped the slave trade across the ocean, it didn't stop slavery in the United States.

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1820- When Missouri was added to the Union in 1820, the question popped up of whether it would be a free state or a slave state. The North wanted Missouri to be a free state because most of Missouri was already in the northern part of the United States. Another reason they wanted it to be a free state, was because if slavery was allowed in Missouri, wouldn't that belief spread to all the Louisiana Purchase? The South wanted Missouri for the opposite reason, if slavery is stopped in Missouri, might it be stopped in all of the Louisiana Purchase? The end result was that Missouri would be added as a slave state, and to keep the balance of power, Maine would be added as a free state. Also, a line would be drawn across the bottom of the Louisiana Territory and all the states above it would be free states, and those below would be slave states. This event led to slavery because first, it created more division between the North and South, and second, it created confusion on whether the Missouri Compromise Line would go through the entire Louisiana Purchase or not.

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1845- The Texas Annexation is the separation of Texas from Mexico. Texas was added to the Union as the 28th state. This event led to the Civil War because like every other establishment of land, the North and South had to argue over it for a free and slave state.

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1845- Manifest Destiny is term that was coined by John O'Sullivan in 1845. The term was the 19th century belief that the expansion westward of the US throughout the American continent was both justified and inevitable. This event led to to the civil war because it encouraged the rapid expansion of the United States which made the issue of slavery more intense.

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1848- The California Gold Rush brought a flood of workers and settlers to California for the most desired thing at the time, gold. This event was important because it brought more people west, very fast. The question soon arose of whether California would be a free state or a slave state. This event led to the Civil War because with more land, comes more arguments and more controversy over slavery.

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1848- The Mexican Cession is the land that was surrendered to the United States by Mexico at the end of the Mexican War. This land, like all the other land, had to be decided by Congress whether it was a free or slave state. This event led to the civil war because it made for more division between the North and the South having to decide what parts of this land would be free and stuff like that.

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1850- The Compromise of 1850 was a compromise between the North and South for the land of the Mexican Cession. Congress decided that California would be a free state, and that the rest would be split up into two territories: Utah, and New Mexico. These territories would be decided by popular sovereignty, which was where the land would be decided by  popular vote. Also, a part of the compromise was The Fugitive Slave Act. The Fugitive Slave Act was an act that made it easier for slaveholders to take back the enslaved people who had run away. This event led to the civil war because the South was getting more and more pro-slavery and North was getting more and more anti-slavery which made for conflict.

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1852- Uncle Tom's Cabin was a book that discussed the horrors of slavery and opened many people's eyes on just how bad slavery was. It was the second best selling book in America in the 19th century, after the Bible. This event led to the Civil War because it created more tension and pushed each side further toward their opinion on slavery.

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1853- The Gadsden Purchase was a southern route from New Orleans westward to California; small strip of land at the end of the Rocky Mountains negotiated from Mexico. This event led to the Civil War because with every new piece of land, conflict comes along with it, whether it will be a free territory, or a slave territory.

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1854- The Kansas-Nebraska Act of 1854 was something that basically repealed The Missouri Compromise and made it so that two new territories would be decided by popular sovereignty. This event led to the civil war because Kansas became a breeding ground for political violence. It was also a problem because since the land was decided by popular sovereignty, many people came to this area so that they could win with their population.

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May 21, 1856- The "sacking" of Lawrence, Kansas was when pro-slavery settlers attacked the anti-slavery town of Lawrence. This event led to the civil war because tensions were getting higher, especially with the Kansas-Nebraska Act, everyone wanted everywhere to be either pro or anti-slavery and they were willing to fight for it.

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May 24 & 25, 1856- In response to the sacking of Kansas, abolitionist, John Brown, most of his family members, and others, went to Pottawatomie, Kansas. This settlement was pro-slavery land. John Brown and his party killed 5 pro-slavery men. This event led to the civil war because it showed how far people were willing to go just so that there was or wasn't slavery and that neither side was going down without a fight.

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1859- As an abolitionist, John Brown supported violent acts against the South in order to end slavery. After the Pottawatomie Massacre during Bleeding Kansas, Brown returned to the North and plotted a much more threatening act. This time, he would raid the federal armory and arsenal at Harpers Ferry, Virginia. The goal was to get weapons and give them to enslaved people, so they could fight back and get out of slavery. This effort didn't work and was stopped; there were several casualties on both sides. This event led to the civil war because it showed how passionate and determined these people were to abolish slavery or keep slavery.

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1860- Abraham Lincoln, a republican, who was anti-slavery, was elected as president. This scared the Southern states because the president had the power to abolish slavery. Not very soon after the polls were closed, 7 states seceded from the Union from 1860-1861. This event led to the Civil War because Abraham Lincoln was the one who eventually abolished slavery, which was what the South was scared of, so the south became more willing to fight for what they believed, even more than before.

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1861- The Battle of Fort Sumter was when Lincoln sent fresh supplies to the troops there who were in danger after several federal forts, including Fort Sumter in South Carolina, became outposts in foreign lands after secession. On April 12, 1861, the confederate warships opened a 34-hour attack on Fort Sumter. This meant the Civil War was underway. This event led to the Civil War because this was the event that initiated the Civil War, and started more violece.