According to the idea of popular sovereignty which of the following would decide

In 1854 Senator Stephen Douglas of Illinois presented a bill destined to be one of the most consequential pieces of legislation in our national history. Ostensibly a bill “to organize the Territory of Nebraska,” an area covering the present-day states of Kansas, Nebraska, Montana, and the Dakotas, contemporaries called it “the Nebraska bill.” Today, we know it as the Kansas-Nebraska Act of 1854.

By the 1850s there were urgent demands to organize the western territories. Land acquired from Mexico in 1848, the California gold rush of 1849, and the relentless trend toward westward expansion pushed farmers, ranchers, and prospectors toward the Pacific. The Mississippi River had long served as a highway to north-south traffic, but western lands needed a river of steel, not of water—a transcontinental railroad to link the eastern states to the Pacific. But what route would that railroad take?

Stephen Douglas, one of the railway’s chief promoters, wanted a northern route via Chicago, but that would take the rail lines through the unorganized Nebraska territory, which lay north of the 1820 Missouri Compromise line where slavery was prohibited. Others, particularly slaveholders and their allies, preferred a southern route, perhaps through the new state of Texas. To pass his “Nebraska bill,” Douglas needed a compromise.

On January 4, 1854, Douglas introduced a bill designed to tread middle ground. He proposed organizing the vast territory “with or without slavery, as their constitutions may prescribe.” Known as “popular sovereignty,” this policy contradicted the Missouri Compromise and left open the question of slavery, but that was not enough to satisfy a group of powerful southern senators led by Missouri’s David Atchison. They wanted to explicitly repeal the 1820 line. Douglas viewed the railroad as the “onward march of civilization,” and so he agreed to their demands. “I will incorporate it into my bill,” he told Atchison, “though I know it will raise a hell of a storm.” From that moment on, the debate over the Nebraska bill was no longer a discussion of railway lines. It was all about slavery.

Douglas introduced his revised bill—and the storm began. Ohio senator Salmon Chase denounced the bill as “a gross violation of a sacred pledge.” In a published broadside, Charles Sumner’s antislavery coalition attacked Douglas, arguing that his bill would make the new territories “a dreary region of despotism, inhabited by masters and slaves.” The fierce drama climaxed in the early morning hours of March 4. “You must provide for continuous lines of settlement from the Mississippi Valley to the Pacific Ocean,” Douglas pleaded in a final address. Do not “fetter the limbs of [this] young giant.” At 5:00 in the morning, the Senate voted 37-14 to pass the Nebraska bill. It became law on May 30, 1854.

The Kansas-Nebraska Act repealed the Missouri Compromise, created two new territories, and allowed for popular sovereignty. It also produced a violent uprising known as “Bleeding Kansas,” as proslavery and antislavery activists flooded into the territories to sway the vote. Political turmoil followed, destroying the remnants of the old Whig coalition and leading to the creation of the new Republican Party. Stephen Douglas had touted his bill as a peaceful settlement of national issues, but what it produced was a prelude to civil war.

From Ohio History Central

Popular Sovereignty is a political term that simply means that the “people are the rulers.” This term is usually used in reference to political issues that are settled by popular vote or to governments based on the concept of democracy. The concept of popular sovereignty manifested itself during the Enlightenment.

During the nineteenth century, the issue of slavery gripped the United States. Rather than confronting the slavery issue directly, federal government leaders routinely avoided the slavery debate by forming compromises that utilized popular sovereignty. Rather than dictating whether or not a territory or state would or would not have slavery, government officials permitted people residing within a territory or state to decide the issue for themselves by popular vote.

The federal government utilized popular sovereignty in both the Compromise of 1850 and again in the Kansas-Nebraska Act of 1854. In the case of the Compromise of 1850, the federal government authorized citizens of the New Mexico Territory, if they ever applied for statehood, to utilize popular sovereignty to determine whether or not slavery would exist within the state’s borders. The United States outlawed slavery before New Mexico applied for statehood. With the Kansas-Nebraska Act, the federal government authorized residents of the Kansas and Nebraska Territories to use popular sovereignty. Kansas applied for statehood first, and pro and anti-slavery advocates resorted to violence to guarantee that their respective sides would win the popular vote. As a result of this violence, usually referred to as Bleeding Kansas, it became clear to most of the U.S. public and government leaders that popular sovereignty was an unlikely solution to the slavery issue.

See Also

Popular sovereignty or the sovereignty of the people's rule is the principle that the authority of a state and its government is created and sustained by the consent of its people, through their elected representatives (Rule by the People), who are the source of all political power.

Who decides whether slavery would be allowed in a territory?

The Democratic standard bearer, Lewis Cass of Michigan, coined the term "popular sovereignty" for a new solution that had begun to emerge. The premise was simple. Let the people of the territories themselves decide whether slavery would be permitted.
Today, popular sovereignty is contained in Article One of the United States Constitution, which states that “the people” are the source of political power and legitimacy.

Which of the following would decide whether slavery would be allowed?

Under the concept of popular sovereignty, the people of each territory would decide whether or not slavery would be permitted.