What was the main feature of the Kansas-Nebraska Act?

The Kansas-Nebraska Act is significant primarily because it created the territories of Kansas and Nebraska while allowing the settlers in those territories to decide whether to allow slavery through the principle of popular sovereignty. This was a pivotal move in the ongoing national debate over the expansion of slavery, as it effectively repealed the Missouri Compromise, which had previously prohibited slavery in that region. By empowering residents to choose for themselves, the act aimed to reduce conflict between pro-slavery and anti-slavery factions, although in practice it led to considerable violence and unrest, known as "Bleeding Kansas." This act exemplified the deepening divisions in the United States regarding the issue of slavery and set the stage for further political conflict leading up to the Civil War.