What best summarizes why part of the nation was upset over the dred Scott desision?

The Dred Scott decision angered many because it denied citizenship and legal rights to African Americans, reinforcing the institution of slavery. It ruled that Congress had no authority to prohibit slavery in the territories, which alarmed those who were fighting for the expansion of free states. This ruling intensified sectional tensions between the North and South, exacerbating the divide over slavery and contributing to the eventual outbreak of the Civil War.