Why did Lewis Cass propose his ideas that would later be known as popular sovereignty?

Lewis Cass proposed the idea of popular sovereignty as a way to address the contentious issue of slavery in the territories of the United States. He believed that allowing the settlers of each territory to decide for themselves whether to permit slavery would reduce sectional tensions and political conflict between the North and South. This approach aimed to promote democracy and local governance, empowering residents to shape their own laws and policies. Ultimately, Cass's proposal was part of a broader effort to find a compromise solution to the divisive issue of slavery during the 1840s and 1850s.