Union and Central Pacific Lines
Im pretty sure its a ballad and it is a great story about a man and his dog climbing a mountain.
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Answer:
1831 | Nat Turner's Rebellion.
1846 - 1850 | The Wilmot Proviso.
1850 | The Compromise of 1850.
1852 | Uncle Tom's Cabin.
1854 - 1859 | Bleading Kansas.
1857 | Dred Scott v.
1858 | Lincoln-Douglas Debates.
The answer should be supercontinent
