"WE THE PEOPLE" Popular sovereignty or the authority of the people referenced in the Preamble of the Constitution - This principle states that government power comes from the consent of the governed (the citizens). One is example of popular sovereignty is the election of representatives and senators in which the citizens hold the vote to elect the legislatures the citizens favor.
The division of korea to north and south korea.
The mountain ranges were natural barriers to invading forces and stopped people from coing into india.