In March 1857 Chief Justice Roger B. Taney announced the opinion of the U.S. Supreme Court in Dred Scott v. John F. A. Sandford, which was the Court’s most important decision ever issued on slavery. The decision had a dramatic effect on American politics as well as law. The case involved a Missouri slave named Dred Scott who claimed to be free because his master had taken him to what was then the Wisconsin Territory and is today the state of Minnesota. In the Missouri Compromise (also known as the Compromise of 1820), Congress declared that there would be no slavery north of the state of Missouri. Thus, Scott claimed to be free because he had lived in a federal territory where slavery was not allowed. In an opinion that was more than fi fty pages long, Chief Justice Taney held that Scott was still a slave, that the Missouri Compromise was unconstitutional, and that Congress had no power to ban slavery from a federal territory. In a part of the decision that shocked many northerners, Chief Justice Taney also held that blacks could never be citizens of the United States and that they had no rights under the Constitution. With notorious bluntness, Taney declared that blacks were “so far inferior, that they had no rights which the white man was bound to respect.” The decision was criticized by many northerners and led many to support the new Republican Party. While it is an exaggeration to say the case caused the Civil War, Chief Justice Taney’s decision certainly infl amed sectional tensions. It also helped lead to the nomination and election of Abraham Lincoln in 1860, which in turn led to secession and the war.