The system of checks and balances is used to keep the government from getting too powerful in one branch. For example, the Executive Branch can veto bills from the Legislative Branch, but the Legislative Branch can override the veto.
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.
Individual rights refer to the liberties of each individual to pursue life and goals without interference from other individuals or the government. Examples of individual rights include the right to life, liberty and the pursuit of happiness as stated in the United States Declaration of Independence .