Why did drew Scott decision alarm northerners?

Drew Scott's decision alarmed Northerners primarily because it intensified concerns about the potential expansion of slavery into new territories and states. His stance was seen as a direct threat to the balance of power in Congress between free and slave states, which heightened tensions leading up to the Civil War. Northerners feared that such decisions would undermine their economic and social interests, further polarizing the nation. This alarm reflected the broader anxieties of the time regarding the future of slavery in America.