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The Missouri Compromise was a law passed in 1820 to keep the number of free and slave states equal in the United States. It allowed Missouri to be a slave state, while Maine was a free state, and set a line to decide where slavery could be allowed in the future.

The Missouri Compromise increased the tension between the North and South over slavery. It only slowed down the conflict, and as new territories joined, the debates over slavery grew, eventually leading to the Civil War.

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The Protective Tariffs of 1828 were taxes on imported goods meant to help American businesses by making foreign products more expensive. This made it harder for people in the South to buy things they needed, leading to a lot of anger and conflict between the North and South.

The Protective Tariffs of 1828 created more tension between the North and South, as Southern states felt they were unfairly burdened by high taxes on goods. This grew the divide over economic interests and states rights eventually contributed to the Civil War.

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The Nullification Crisis was a conflict in the 1830s when South Carolina tried to cancel federal tariffs that they believed were unfair. This led to a fight between the state and the federal government, as President Andrew Jackson stood firm against their actions.

The Nullification Crisis increased the fact that Southern states felt they had the right to ignore federal laws. This conflict over states rights and government power was one of the key issues that helped spark the Civil War.

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The Mexican-American War took place from 1846 to 1848 over land disputes and Texas' annexation. The U.S. won and gained a lot of territory, including California and New Mexico.

The Mexican-American War added more land to the United States, which raised different opinions about whether new states would allow slavery. This disagreement created a bigger divide between the North and South. This was one of the reasons for the Civil war.

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Uncle Tom's Cabin was a novel written by Harriet Beecher Stowe that tells the story of a slave named Uncle Tom and his struggles against slavery. The book had a big impact on people's views about slavery and helped increase the abolitionist population in the years leading up to the Civil War.

Uncle Tom's Cabin showed new perspectives about the harsh realities of slavery, making many people in the North more opposed to it. This event was one that eventually led to the Civil War.

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The 1850 Compromise was a set of laws designed to keep peace between slave and free states in the U.S. It allowed California to join as a free state while giving new territories the choice to be a slave state.

The 1850 Compromise made the North and South more conflicted because it allowed slavery to spread into new territories. This angered many people in the North, leading to more conflict and eventually contributing to the start of the Civil War.

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The Kansas-Nebraska Act allowed the territories of Kansas and Nebraska to decide for themselves whether to allow slavery. This led to lots of violence between pro-slavery and anti-slavery settlers, which became known as Bleeding Kansas.

The Kansas-Nebraska Act increased the tension between the North and South by letting new territories choose about slavery, causing many fights. This conflict led to the growing divide in the country, which basically helped spark the Civil War.

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Bleeding Kansas was a violent conflict in the mid-1850s between pro-slavery and anti-slavery settlers in Kansas over whether it would enter the Union as a free or slave state.

The different opinions on the slavery situation continued to in the end lead to violence and finally got so violent the Civil war was caused.

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The Dred Scott decision was a Supreme Court ruling that said African Americans could not be citizens and had no right to sue in court. It also declared that Congress couldn't stop slavery in the territories, which made many people in the North really angry.

The Dred Scott decision upset many people in the North because it protected slavery and denied rights to African Americans. It increased tensions between the North and South, pushing people closer to the Civil War.

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John Brown’s raid on Harpers Ferry in 1859 aimed to start a slave revolt by taking weapons. While it failed and led to Brown’s execution, it heightened tensions over slavery in America.

John Brown's raid on Harpers Ferry intensified the debate over slavery, making people in the North more passionate about abolition and causing more fear in the South. eventually the divide was a cause of the civil war.

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The 1860 election was key in U.S. history because Abraham Lincoln, a Republican, won with vice president Hannibal Hamlin while opposing the expansion of slavery.

His victory led to several Southern states seceding, which started the Civil War because of everyone having different beliefs.

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The Ordinance of Secession was a declaration by Southern states to leave the United States. They wanted to have their own government, mainly to protect their way of life, which included slavery.

The Ordinance of Secession contributed to the Civil War because it showed how divided the North and South had become. When Southern states decided to break away from the Union, it created a lot of problems, and soon after, fighting broke out between the two sides.