What Supreme Court ruling contributed to the Civil War when the majority opinion said black people, whether free or not, were not citizens and could not file lawsuits?

Dred Scott was an enslaved black man whose owners had taken him from a slave-holding state into a free territory. Scott sued in court for his freedom, claiming that because he had been taken into "free" U.S. territory, he had automatically been freed and was legally no longer a slave. The decision outraged abolitionists who saw it as a way to stop debate about slavery in the territories.

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