Popular Sovereignty: "The people of the country establish the government and give it power." Popular Sovereignty is basically a principle stating that the people have a say. It is the people's right to have a say in the happenings of the country.
Ex: When people go to the polls to vote, that is an example of popular sovereignty. By going to the polls and voting for laws, the president, and various government officials, they are exercising their right of popular sovereignty. The government has to do what the majority of the people want.