Popular sovereignty was well supported because it allowed the local citizens of a territory to decide if slavery was to be allowed or illegal. Stephen A. Douglas pushed for popular sovereignty during the 1840's.
Popular sovereignty. And by any chance, are you asking this because of a social studies map pack?
It was called 'Popular Sovereignty', and Senator Stephen Douglas of Illinois was confident that it would settle the issue and avert war. In fact, it caused the bloodshed the first time it was tried - in Kansas - and helped to start the war.
Millard Fillmore supported this compromise and signed it into law. It did little to settle the slavery issues it was designed to settle.
Based on the times in which this slogan was created, and remembering that the US Supreme Court in its 1857 ruling on Dred Scott and slavery, popular sovereignty appeared to be the "democratic way" to settle issues of slavery in the Territories that would in time become States. As it was seen after the US Civil War, it required an amendment to the US Constitution to officially abolish slavery. The problems that popular sovereignty created, in Kansas due to the Kansas - Nebraska Act, was bloodshed in conflicts between pro slavery people and anti slavery people. It's difficult to make a case for any "cons" of allowing people the right to vote on issues. The main problem was the US Supreme Court with its rulings in favor of keeping slaves in the class of "property". The lawlessness in Kansas was the result of Federal troops non enforcing Federal laws in the US Territories. Taken in a much broader sense, the United States elects government officials on the basis of popular sovereignty. If fighting conflicts result in the course of elections, the duty of law enforcement is to enforce laws against violence. All this must be taken in the context of the 1800's.
With the slavery issue based on popular sovereignty, the territories would become slave or free depending on which side had more votes. Both antislavery Northerners and proslavery Southerners scrambled to settle Kansas. One fierce slavery opponent, John Brown, killed five proslavery people in a raid and started a small civil war that killed some 200 people from both sides.
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In the period of time after the Kansas-Nebraska Act was passed by Congress, there was armed conflict between pro and anti slavery factions in the Kansas territory. Bleeding Kansas was the result of popular sovereignty. At the time the idea birthed by Senator Stephen Douglas seemed the American way to settle disputes. Few expected the violence that erupted in Kansas soon after the Act was passed.
South Carolina was voting to secede at the same time that Crittenden was pushing a compromise to settle the slavery question.
i think ihere because they used slavery in old dayes then there was a new mayor and said slavery is a lawa