What reason did the supreme court give for its ruling that dred Scott a blcak man could not be a citizen of the US?

The Supreme Court ruled in Dred Scott v. Sandford (1857) that Dred Scott, being a black man and a slave, could not be considered a citizen of the United States. The Court argued that the framers of the Constitution did not intend for people of African descent to be included as citizens, as they were viewed as property rather than individuals with rights. This ruling reinforced the notion of racial inferiority and denied African Americans fundamental legal protections.