Final answer:
The Fugitive Slave Act, Kansas-Nebraska Act, and Dred Scott Decision were significant in the lead-up to the Civil War.
Explanation:
Three significant documents or laws in the lead-up to the Civil War were The Fugitive Slave Act, The Kansas-Nebraska Act, and The Dred Scott Decision. The Fugitive Slave Act of 1850 required that all escaped slaves, upon capture, be returned to their enslavers and was highly controversial. The Kansas-Nebraska Act of 1854 led to violent confrontations in Kansas and intensified sectional tensions. The Dred Scott Decision of 1857 ruled that African Americans were not considered citizens and led to further divisions between North and South.
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