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The American Revolution was an ideological and political revolution, which arose from growing tensions between residents of Great Britain’s 13 North  American colonies and the colonial government, which represented the British crown.

• This was an event that caused the Civil War because it was what let America free from Britain and created a country.

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After the government decided that the amount of political representation a state would receive, Southern states found an issue of how slaves should be counted. Since Northern states did not rely heavily on slaves unlike Southern states, they didn't want slaves to count towards the population total because the South would have more representation. This compromise states that for every five slaves, they would count as three people.

• This led up to the civil war because a slave would not be equivalent to an American citizen because of this trade. Slave owners used their slaves as a way to earn more political representation in the government.

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Map of the previously prohibited Northwest Territory.

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Great Britain gives up the Northwest Territory • 1783

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Great Britain gives up the Northwest Territory • 1783

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Great Britain officially left the area to the United States at the end of the American Revolutionary War, they left nearly three months after the Treaty of Paris was signed. This was formed from unorganized western territory of the United States.

• This was what set out the process for territories to become states and it was the first and only federal anti-slavery policy pre-Civil War.

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The Northwest Ordinance proposed that 3-5 new states would be created from the North Western territory, this territory was officially incorporated with the Ordinance of 1787. This provided for civil liberties within the new territories, but did not allow slavery. Pro-slavery Southerners were willing to go along with the Ordinance because they believed that the new states would be populated with White settlers from the South and their slaves.

• This caused the civil war because it opened a new piece of land that was against slavery, ultimately causing slavery to come to an end.

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Thomas Jefferson was elected for President • 1801

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Thomas Jefferson was elected for President • 1801

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When Thomas Jefferson was elected as president, most of the population of the US lived within 50-100 miles of the Atlantic Ocean.

• His presidency caused America's land to double and to eventually grow as a country.

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The Louisiana Purchase was the purchase of Louisiana Territory from France in 1803. The US paid $15 million (quarter of $1 billion in today’s dollars) for approximately 827k square miles of land. The Louisiana Territory stretched from the Mississippi River to the East of the Rocky Mountains in the West and from the Gulf of Mexico in the South to the Canadian border in the North.

• This purchase allowed the residents of the original 13 colonies to expand into the Northwest Territory.

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Tasked by President Jefferson to map the territory, establish friendly trade relationships with native tribes, and search for a waterway to connect to the Pacific Ocean. Lewis and Clark journeyed more than 8,000 miles for 2 years, from Missouri to the Pacific Ocean. On May 14 1804, the Corps of Volunteers for North West Discovery, including Lewis and Clark and four dozen other men, started up the Missouri River aboard a 55 ft long keelboat and two smaller boats.

• This caused the Civil war because this expedition provided information about the territory before heading west.

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The Spanish Cession (the Florida Purchase from Spain) was a cession between the United States and Spain in 1819 that ceded Florida to the U.S.

• This caused future events because it defined the boundary between the U.S. and New Spain.

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The Missouri Compromise, passed in 1820, admitted Missouri to the Union as a slave state and Maine as a free state. This compromise was a United States federal legislation that stopped northern attempts to forever prohibit slavery's expansion.

• This compromise was one of these 20 events which led up to the American Civil War because it prevented caused even more tension between the South and the North while states were admitted to the Union.

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The Texas annexation was the annexation of the Republic of Texas into the United States of America in 1845. Texas was admitted to the Union as the 28th state on December 29, 1845 as a slave state. The Republic of Texas declared independence from the Republic of Mexico on March 2, 1836. It applied for annexation to the United States the same year, but was rejected by the Secretary of State.

• This caused the American Civil War and the other events which also led up to this war because this added a state into the Union as a slave state.

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In 1846 the Oregon Treaty was signed between the US and Britain to settle the boundary dispute. This Territory of Oregon encompassed the segments of present-day Idaho, Oregon, Washington, Wyoming and Montana as well as parts of British Columbia which is now a Canadian province.

• This led up to the Civil War because it was one of the first successes of Manifest Destiny, which was the belief that American settlers were entitled to conquer and control North America.

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The Mexican Cession was the land of California, Arizona, Nevada, New Mexico, Utah, and parts of Colorado and Wyoming which was ceded to the United States by Mexico at the end of the Mexican War. This land was acquired in 1848  in the Treaty of Guadalupe Hidalgo.

• This cession impacted the issue of slavery, and the focus of sectionalism in the United States. This fueled sectionalism and the Southern section's desire for secession from the union.

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The Fugitive Slave Act of 1850 required that slaves would be returned to their owners, even if they escaped to a free state. The act also made the federal government responsible for finding, returning, and trying escaped slaves. Fugitive Slave Acts, in U.S. history, statutes passed by Congress in 1793 and 1850, which was repealed in 1864.

• The Fugitive Slave Act was an event which led up to the Civil War because it caused escaped slaves to be forced back to their slave-owners. This caused escapee's freedom to be even more limited compared to what was before.

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The Compromise of 1850 was made up of five bills that attempted to resolve disputes over slavery in new territories added to the United States. The United States Congress abolished the slave trade in the District of Columbia on September 20, 1850, as part of the legislative package called the Compromise of 1850.

• This led up to the civil war because it ended the slave trade in Washington D.C. which resembles liberty and freedom for all in the United States.

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The Gadsden Purchase was an agreement between the United States and Mexico, which was finalized in 1854, in which the United States agreed to pay Mexico $10 million for a portion of Mexico that later became part of New Mexico and Arizona.

• The Gadsden Purchase intensified the simmering conflict over enslavement and helped to inflame the regional differences that eventually led to the Civil War.

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This Kansas Nebraska Act was an act that created two new territories, Kansas and Nebraska. In order to decide whether or not these states would be slave or free states, the government decided to allow popular sovereignty. Popular sovereignty is the idea that the authority of a state and its government are both created and sustained by the permission of its people.

• This act led up to the Civil War because it created more tension between the South and North, while adding land and allowing the people to decide for themselves by voting. This also caused many violent events between the Southern and Northern states.

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Bleeding Kansas in Washington D.C. • 1856

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Bleeding Kansas in Washington D.C. • 1856

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Charles Sumner, an abolitionist Senator, gave a speech named "The Crime Against Kansas". He was later attacked by Preston Brooks, a Representative. Preston Brooks stated that Sumner insulted Brooks' uncle in his speech. Two days later, Brooks attacked Sumner again with his cane until it broke, these injuries would impact Charles Sumner for the rest of his life.

• This led up to the war between the South and the North because it expressed the violence and tension between these two different communities.

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On May 15, 1854, the federal court heard the Dred Scott v. Sandford case and ruled against Scott, detaining him and his family in slavery. This was a legal case in which the Supreme Court on March 6, 1857, ruled (7–2) that a slave, Dred Scott, who had resided in a free state and territory was not thereby entitled to his freedom; that African Americans were not and could never be citizens of the United States. The Missouri Compromise, which had declared free all territories west of Missouri, was unconstitutional.  On March 6, 1857, in the infamous Dred Scott decision, Scott lost his fight for freedom again.

• This led up to the Civil War because he was one of the many African Americans which were forced back into slavery, he was one of the many slaves who fought for equality. Only a tiny percentage of the 12.5 million Africans shipped to the New World landed in North America.

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Abraham Lincoln was elected for President • 1860

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Abraham Lincoln was elected for President • 1860

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Abraham Lincoln was an American lawyer and statesman who was the 16th president of the United States until he was assassinated in 1865 by John Wilkes Booth, who later died in the same year by soldier Boston Corbett.

• This caused the American Civil War by leading the nation throughout the war and and succeeded in preserving the Union, bolstering the federal government, modernizing the U.S. economy, and abolishing slavery.

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The Battle of Fort Sumter was an attack which marked the official beginning of the American Civil War. This was the bombardment of Fort Sumter near Charleston, South Carolina by the South Carolina militia. It ended with the surrender by the United States Army, beginning the American Civil War.

• This was the event which caused the American Civil War, as said before it was the beginning of this war. This battle was one of the many breaking points before the war started.