How did Dred Scott led the outbreak of the Civil War?

The Supreme Court case, "Dred Scott v. Sandford", was a case concerning his personal freedom. Dred Scott argued that since he lived in a free state with his master, he was entitled to emancipation. The case reached the Supreme Court, where it was ruled that no blacks, whether free or owned, could claim US citizenship, which fueled an outrage that led to the Civil War.