The Dred Scott Decision There have been several cases in the history of the Supreme Court that have had a powerful impact on both the highest court of the land and the history of the United States. The Dred Scott decision can definitely be included in this category of monumental cases that changed the course of American history. Until this decision the Supreme Court had a flawless reputation. Its prestige and credibility were beyond reproach. This high regard for the Supreme Court made people on both sides of the slavery issue turn to it in the hope that what could not be resolved in the political world could be solved in the le