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,

February 1848 is when it was added. if that's what you were asking

A) the gas is compressed