Final answer:
Popular sovereignty is the idea that government's power comes from the consent of the people, allowing them to make decisions and govern themselves.
Step-by-step explanation:
Popular sovereignty is the idea that government's power comes from the consent of the people. It means that the people have the ultimate authority in making decisions and governing themselves. For example, when residents of a territory have the right to decide whether or not to allow slavery, it is an application of popular sovereignty.