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Constructed by Harriet Tubman, someone who escaped from slavery, wanted to help other slaves escape, So she gathered them up and helped escape from underground. This was known as the Underground Railroad and isn't literal, because there was no railroad.

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In May, 1854, a voting took place where you could decide yes slavery or no slavery, but it turned into a fight, which led to the Missouri Compromise. " The Kansas Nebraska Act, also known as the Bleeding Kansas, divided the North and the South and led to the Missouri Compromise and moved one step closer to the Civil War. https://www.archives.gov/milestone-documents/kansas-nebraska-act

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This made states, such as Maine as a non slave state, but kept states like Missouri as a slave state. "The Missouri Compromise also proposed that slavery be prohibited above the 36º 30' latitude line in the remainder of the Louisiana Territory." https://www.archives.gov/milestone-documents/missouri-compromise#:~:text=This%20legislation%20admitted%20Missouri%20as,remainder%20of%20the%20Louisiana%20Territory.

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Scott was into slavery with his family, but he wasn't supposed to be because of the Missouri Compromise and the Supreme Court declared the Missouri Compromise unconstitutional. This made the North Furious and was a step away from social justice, and was a cause of the Civil War.
The decision also argued that the Missouri Compromise legislation — passed to balance the power between slave and non-slave states — was unconstitutional. In effect, this meant that Congress had no power to prevent the spread of slavery."
https://www.history.com/topics/black-history/dred-scott-case

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The battle that started the Civil War, the Civil War was a violent War between the North and South of disagreements about slavery.
"The battle was fought on July 21, 1861, in Prince William Country, Virginia just north of the city of Manassas and about thirty miles west-southwest of Washington, D.C."
https://en.wikipedia.org/wiki/First_Battle_of_Bull_Run

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The Battle of Antietam was a battle of the Civil War and at the end if the battle, it led to the Emancipation Proclamation. "The Battle of Antietam (also known as Sharpsburg) provided the necessary Union victory to issue the Emancipation Proclamation."
https://www.battlefields.org/learn/articles/10-facts-emancipation-proclamation#:~:text=Fact%20%234%3A%20The%20Battle%20of,to%20issue%20the%20Emancipation%20Proclamation.

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The Emancipation Proclamation was a huge step towards the Social Justice Movement, because it outlawed slavery in several states. ”In 1863 President Lincoln issued the  ”In 1863 President Lincoln issued the Emancipation Proclamation declaring “all persons held as slaves within any State, or designated part of a State, the people where of shall then be in rebellion against the United States, shall be then, thenceforward, and forever free.” declaring “all persons held as slaves within any State, or designated part of a State, the people whereof shall then be in rebellion against the United States, shall be then, thenceforward, and forever free.” (https://www.archives.gov/milestone-documents/13th-amendment#:~:text=Lincoln%20recognized%20that%20the%20Emancipation,have%20easily%20passed%20in%20Congress.)

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The Civil War lasted for 4 years, then finally, the North Won and the North disagreed with slavery, so the 13th Amendment was signed. “The 13th Amendment was passed at the end of the civil war." (https://www.britannica.com/question/Who-won-the-American-Civil-War

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The 13th Amendment was signed at the end of the Civil War and it banned slavery forever inside the United States. “The Thirteenth  Amendment abolished slavery in the United States.” Those who continue to do slavery shall face consequences as for it is banned and illegal. Neither slavery nor involuntary servitude, except as punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.” https://www.history.com/topics/black-history/thirteenth-amendment

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The 15th Amendment was signed in 1870, which gave African Americans the right to vote. "Black males were given the vote by the 15th Amendment. In retrospect, it can be seen that the 15th Amendment was in reality only another step in the struggle for equality" https://www.archives.gov/milestone-documents/15th-amendment#:~:text=Passed%20by%20Congress%20February%2026,men%20the%20right%20to%20vote.