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in the Mexican-American War added new territory to the United States. 4 new slave States and 4 new Free new States Were accepted into the union between 1520 and 1848 a with 15 of each, this maintained the balance between Free and Slave States.However, the Mexican - American war threaten to disable the balance.

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The Missouri compromise did not apply to the huge territory gained From Mexico In 1848. the issue was crucial to the northerners who wanted to stop Slavery from spreading, Many Supporters Of slavery viewed it as an attack on slavery by the North and an attempt by the south to gain too much power. With the territories controlled by the Us, The nations could no longer ignore Slavery issues. By making these territories a state it would harm the balance between Free States and Slave States, but after a while Henry proposed an agreement and gave both sides what they wanted.

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The Kansas-Nebraska Act repealed the Missouri Compromise, created two new territories, and allowed for popular sovereignty. It also produced a violent uprising known as "Bleeding Kansas," as pro slavery and antislavery activists flooded into the territories to sway the vote. The Kansas-Nebraska act made it possible for the Kansas and Nebraska territories to open to slavery. The Missouri Compromise had prevented this from happening since 1820.

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Bleeding Kansas caused the divide of Douglas' democratic party. This inspired the formation of the Republican party. The Republican party opposed the extension of slavery into new territory. Nebraska was so far north that it was almost guaranteed to become a free state. Kansas bordered the slave state of Missouri.

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Abolitionist John Brown lead a small group on a raid against a federal armory in Harpers Ferry, Virginia (now West Virginia). This was an attempt to start an armed revolt of enslaved people and destroy the institution of slavery. They chose the ferry  because of the gateway to the south. John Brown and his band of 16 whites and five blacks seized the armory on the night of October 16.

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Dred Scott was born into slavery. Dred Scott was also known as Dred Scott v. Sandford. This was a decade-long fight for freedom by a black enslaved man named Dred Scott. The case persisted through several courts and ultimately reached the U.S. Supreme Court, whose decision incensed abolitionists, gave momentum to the anti-slavery movement and served as a stepping stone to the Civil War.

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Douglas was accusing Lincoln of being an abolitionist while Lincoln accused Douglas of wanting to nationalize slavery. Lincoln and Douglas were not simply campaigning for themselves but also for their respective political parties. The main focus that Douglas and Lincoln were paying attention to was slavery.

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In The Election of 1860, Lincoln caused the civil war. Lincoln and Douglas were the people waiting to be elected and Lincoln Won. After Lincoln won, the Southern was outraged and seceded. The South argued that Lincoln won the election.

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When Lincoln won the election of 1860, the south kept arguing that he didn't win. But, when they tried to argue, they failed and seceded. They seceded their own country and they also seceded South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas.

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The attack on Fort Sumter and the start of the Civil war 

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The attack on Fort Sumter and the start of the Civil war 

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Located on an island in the harbor of Charleston, South Carolina. The fort's commander would not surrender it. South Carolina authorities decided to starve the fort's 100 troops into surrender. Lincoln did not want to give up the fort. The Confederate attack on Fort Sumter marked the beginning of a long civil war. Confederate leaders decided to capture the fort while it was isolated. After 34 hours, with the fort on fire, U.S. troops surrendered. Confederate President Jefferson Davis said he would send food to the fort, but that the supply ships would carry no troops or guns.