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The Missouri Compromise was a United States "Legislation" that stopped the northern states from trying to stop slavery by making Missouri a slave state and making Maine a free state.
No, I do not think that the Missouri compromise would have been a lasting compromise and agreement between both sides, because eventually one side would want more land and there would be a big disagreement.
https://www.history.com/topics/abolitionist-movement/missouri-compromise

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The Wilmot Proviso was a proposal to stop slavery in the newly acquired land from the Mexican-American War.
The Wilmot Proviso was protested by the southerners, because the southerners were in favor and used to slavery. Also, the newly acquired land was mostly in the south. https://www.britannica.com/event/Wilmot-Proviso

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The Free-Soil Party was a short coalition of people that eventually merged into the republican party, they opposed the expansion of slavery in the United States. They lost the presidential election, but managed to get a few spots in congress.
The Party supported free grants of public land to settlers, which could have helped grow the republican party and get the ideas out across the United States, especially the west(the west was one of the main focuses).
https://ohiohistorycentral.org/w/Free_Soil_Party

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The Compromise of 1850 was a series of laws passed by the United States, it was created because of conflict as to whether the new states from the Mexican War should be slave states.
Hurdles faced passing this, were that many northern states did not follow the rules, like the fugitive slave act.
https://www.pbs.org/wgbh/aia/part4/4p2951.html

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The Fugitive Slave Act was an act that called for the capture and return of runaway slaves from their territories to the slavery prohibited states.
Henry David Thoreau fought against the fugitive act by playing a role as an abolitionist, which eventually condemned the act.
https://www.battlefields.org/learn/primary-sources/fugitive-slave-act

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This act repealed the Missouri Compromise, created new territories, and allowed popular sovereignty. People like Douglas wanted popular sovereignty to solve the problems, so he passed this act.
https://www.ushistory.org/us/31a.asp

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Period of repeated outbreaks of violent warfare between anti and pro-slavery parties, following the new Kansas territory in 1854.
If the Missouri Compromise was never repealed and replaced, I believe that the violence would have still happened, but not to this degree. I feel that the violence and war was inevitable, because the nation could not just simply let the issue of slavery go.
https://www.nps.gov/articles/bleeding-kansas.htm

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It was a supreme court case that decided in favor that slaves were not citizens. This meant that they could not be protected by the government and had no rights. This seems like a very corrupt and pro-slavery decision. This gives reason to believe that in that time period, the court was not fair and was pro-slavery.
https://www.archives.gov/milestone-documents/dred-scott-v-sandford

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Series of 7 debates between Lincoln and Douglas during the 1858 Illinois senatorial campaign. One of the debates involved the Freeport Doctrine, which said that slavery could be excluded in territories of the United States by local government.
The Freeport Doctrine won Douglas the respect and support of the anti-slavery Americans, while the opposite happened with the Pro-Slavery Americans.
https://www.battlefields.org/learn/articles/lincoln-douglas-debates

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Abolitionist John Brown attempts to lead a small group of slaves on a raid against a federal armory in an attempt to destroy the institution of slavery.
The cause for the raid was good. However, the way John Brown executed this raid was terrible. Many lives were lost because of this. He is justified for the plan, but not for the execution.
https://www.nps.gov/articles/john-browns-raid.htm

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This presidential election was the election that declared Abraham Lincoln president. It was between Abraham Lincoln, John C. Breckenridge, John Bell, Stephen Douglas.
The divided political parties helped lincoln win the election, because of the fact that almost all of the north was republican, The republican party supported anti-slavery ideas. This meant that almost the whole north was going to vote for lincoln.
https://encyclopediavirginia.org/entries/united-states-presidential-election-of-1860/

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The action of withdrawing formally from membership of a federation or body, especially a political state. In this case, the southern states were seceding from the United States to form the Union.
Secession most likely could not have been a lasting solution to the problem between the north and south. The South would need resources from the north, and the other way around. Without this interdependence with resources, the union would eventually fall apart and join the U.S. with the north again.

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This historical fort was where the first shots/battle of the 1861 civil war happened. Lincoln who was in favor of anti-slavery sent a hostile fleet to Fort Sumter to resolve the problem and stop the violence.
https://www.nationalgeographic.org/thisday/apr12/battle-fort-sumter/