One reason the Missouri Compromise did not have long-lasting effects is that it was ultimately overturned by the Kansas-Nebraska Act of 1854. The Missouri Compromise had established a line, the 36°30' parallel, with the intention of maintaining a balance between slave and free states in the United States. However, the Kansas-Nebraska Act allowed for popular sovereignty in the territories of Kansas and Nebraska, meaning that the residents of these territories would decide whether to allow slavery or not. This effectively nullified the line established by the Missouri Compromise and led to widespread violence and tension in Kansas, known as "Bleeding Kansas," as pro-slavery and anti-slavery forces clashed. The Kansas-Nebraska Act highlighted the growing divisions over slavery and ultimately paved the way for the Civil War, rendering the Missouri Compromise ineffective and short-lived.
