Though the Missouri Compromise managed to keep the peace—for the moment—it failed to resolve the pressing question of slavery and its place in the nation's future. ... The controversial law effectively repealed the Missouri Compromise by allowing slavery in the region north of the 36º 30' parallel.
Answer: The Missouri Compromise was ineffective in dealing with the issue of slavery because it increased sectionalism between Northern and Southern states. Instead of solving this issue of slavery in new territories Congress only increased the tension between North and South.
