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1783 Great Britain gives up their land in the U.S.

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1783 Great Britain gives up their land in the U.S.

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After the American Revolution, Great Britain gives up their land stretching from the Appalachian Mountains to the Mississippi River. This is a key event in the early 19th century because this is when the U.S. gained independence and Great Britain's land. Also, this event led to the civil war because this is when the U.S. was allowed to make their own laws, including laws on slavery.

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When the U.S. gained the Northwest Territory, they decided they were going to make 3-5 new states out of this area that would all ban slavery. This is a key event in the early 19th century because this was the first whole territory that slavery was banned in. Also, this event helped lead to the civil war because once the south found out that an entire territory banned slavery, the south thought there should be more slave states.

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When the cotton gin was invented, it revolutionized the cotton industry, which caused a huge demand for slave labor in the south. This is a key event in the early 19th century because the cotton gin revolutionized the cotton industry. Also, this event helped lead to the civil war because the cotton gin required a lot of people to operate it so, the slave trade was exploding in popularity again.

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1801 Thomas Jefferson elected as president

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1801 Thomas Jefferson elected as president

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On March 4th 1801 Thomas Jefferson was elected President of the United States. This is a key event in the early 19th century because Thomas Jefferson made some of the most key decisions in the 19th century. This contributed to the start of the civil war because, for example, Thomas Jefferson made the decision of the Missouri compromise, which was very controversial. This was controversial because of the different beliefs between the north and the south.

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1803 Thomas Jefferson purchased the Louisiana Territory

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1803 Thomas Jefferson purchased the Louisiana Territory

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In 1803 Thomas Jefferson negotiated the purchase of the Louisiana Territory from the French leader Napoleon, this territory would double the size of the U.S. This is a key event in the early 19th century because with the Louisiana territory doubling the size of the U.S. America would gain a lot of power. This event helped lead to the civil war because congress would have to figure out a way to split the Louisiana territory into free states and slave states without either side getting angry and wanting more land.

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Meriwether Lewis and William Clark set off from St. Louis, Missouri with their team, the Corps of Discovery, in hopes to explore the west and find a waterway that goes from the Pacific Ocean to the Mississippi River. This is a key event in the early 19th century because the corps of discovery led the start of westward expansion. This event helped lead to the civil war because with every new state the U.S. gained the question was going to be a free state or a slave state was asked.

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In 1808 both the north and the south congressman came together and agreed to abolish the slave trade. The only reason the south agreed to abolish the slave trade is because  they get to immediately make the slave children slaves as well. This is a key event in the early 19th century because this was the end of all slave trade in the U.S. and more people being taken from their homes to become slaves. Also, this helped lead to the civil war because with the slave trade being shut down, the south would want more slave states so, there would be more fugitive slaves.

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The British cession also known as the treaty of 1818 was a compromise between the United States and Great Britain which resolved most border issues between the U.S. and British North America. This is a key event in the early 19th century because when this territory was gained the question, "would this be a slave state or a free state" was asked again. This event helped lead to the civil war because the British cession ended up being a slave free, so the south wanted more states where slavery was allowed.

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In 1819 America negotiated to buy the Florida Territory from Spain for $5 million dollars. That land included Florida and parts of Alabama, Mississippi, and Louisiana. This is a key event in the early 19th century because with the Florida territory being gained and below the Missouri compromise line, it would soon be a slave state. This event contributed to the start of the civil war because when the Florida territory became a slave state, the north thought the slave state power in congress would increase a lot so, it increased the tension between the north and the south.

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Congress came to an agreement to allow Missouri to join the union as a slave state, but Maine would be changed to a slavery free state. This is a key event in the early 19th century because with the compromise line being made, no one knew if slave states or free states would have more power. This event helped lead up to the civil war due to the tension continuing to rise between the north and the south. The tension is rising because both the north and south states wanted more power in congress.

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Congress annexed Texas into the union as a slave state. This is a key event in the early 19th century because when Texas was added to the Union, the power of the South states in Congress also increased. This contributed to the start of the Civil War because the tensions rose again between the North and the South due to more power being gained by the south.

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A journalist, John O'Sullivan, came up with the term/phrase Manifest Destiny. This is a key event in the early 19th century because when the term "Manifest Destiny" grew in popularity, more and more people started wanting to move West in hopes of a better life. Also, this helped with the start of the Civil War because every new state that was added to the Union due to people moving West caused the debate if a state would be a slave state or a free state.

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1845-1849 J.K. Polk, served as president

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1845-1849 J.K. Polk, served as president

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James k. Polk was the eleventh president, who served from 1845-1849, he also negotiated the split of the organ country. This is a key event in the early 19th century because with J.K Polk being elected in negotiating for the Oregon Country, nobody knew if the Oregon Country would be composed of free states or slave states. This also contributed to the start of the Civil War because this also made the tensions between the North and the South rise again over slavery disputes.

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President Polk negotiated with Britain to divide the Oregon country into two parts. This is a key event in the early 19th century because with the U.S. gaining half of the Oregon Territory, nobody knew if the U.S.'s part of the Oregon Country would be free Territory or Slave Territory. This helped the start of the Civil War due to the increase in slave states or free states.

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The U.S. gains the Mexican Cession after the U.S. won the Mexican American war. This is a key event in the early 19th century because when the U.S. gained the Mexican cession, the U.S.'s territory increased so, every state gained from the cession the question, would this be a free state or a slave state, would be asked. This contributed to the civil war because both the north and the south wanted the states in the Mexican cession, so they could get more power in congress.

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Northern and southern congressmen allow California to be added to the union as a free state, while the other states in the Mexican cession will be decided by popular sovereignty. This is a key event in the early 19th century because the south thought that if California was added to the union as a free state then, more of the Mexican cession would allow slavery. This contributed to the start of the civil war because California being added to the union as a free state made the south want more slave states .

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In order to build a rail-road from New Orleans to California, the U.S. negotiated with Mexico to gain a small piece of land called the Gadsden Territory. This is a key event in the early 19th century because without the purchase of the Gadsden territory, the U.S. wouldn't be able to build the rail-road from New Orleans to California to transport goods and people across the country. This helped contribute to the start of the civil war because even though the Gadsden purchase was used for a rail-road, the states that were made of the territory were all slave states. Due to the Gadsden purchase, becoming slave states, the relationship between the north and the south weakened because now the north wanted equal free states as slave states.

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Both Kansas and Nebraska would decide the issue of slavery by popular sovereignty, which was the cause of bleeding Kansas. This is a key event in the early 19th century because the Kansas, Nebraska act caused a mini war in both the states which killed many people. This contributed tot the start of the civil war because with Kansas and Nebraska's slavery decision decided by popular sovereignty. Many people started fighting for their belief about slavery.