In the Dred Scott v. Sandford case, the Supreme Court ruled that the Missouri Compromise was unconstitutional and that African Americans were not citizens under the US Constitution and therefore did not have the same rights and privileges that US citizens had. This allowed slavery to prevail and to have more power, which is where the "The Triumph of Slavery" headline comes from. This Supreme Court case overall was a massive gain to slavery, but a huge loss to actual slaves.
