What was the dred scott decision? what did it mean for those opposed to slavery

Dred Scott decision, the Supreme Court ruled that Mr. Scott, a slave who had spent part of his life in non-slave territory, could not sue for his freedom in a federal court because, as the March 7 New York Times summarized, “Negroes, whether slaves or free, that is, men of the African race,

Cwould be the answer