Answer:
While the American Civil War (1861—1865) was devastating for the United States in terms of human loss of life, it was also the event that caused the American states to finally become united. A variety of events prompted the war, not just the underlying issues of slavery and states rights. From the end of the Mexican War to the election of Abraham Lincoln, the war’s roots were numerous and diverse.
The Fugitive Slave Act was passed as part of the Compromise of 1850. This act forced any federal official who did not arrest a runaway slave to pay a fine. This was the most controversial part of the Compromise of 1850 and caused many abolitionists to increase their efforts against slavery. This act also prompted more activity along the Underground Railroad as fleeing slaves made their way to Canada.
In 1854, the Kansas-Nebraska Act was passed, allowing the Kansas and Nebraska territories to decide for themselves using popular sovereignty whether they wanted to be free or slave. By 1856, Kansas had become a hotbed of violence as pro- and anti-slavery forces fought over the state's future to the point where it was nicknamed "Bleeding Kansas." The widely reported violent events were a small taste of the violence to come with the Civil War.
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