Romans believed that as long as Carthage existed it would always pose a threat because if you defeat them and don't destroy them they will just rise again and want to defeat Rome again so they decided that it was necessary to completely wipe them off the face of Earth, which is what happened in the end, as you can see since there's no Carthage any more.
Every nation has a chief of state, a person who serves as the symbolic leader of the country and represents the nation. In the United States, the president both leads the government and acts as the chief of state, although this is not the case in many countries. As chief of state, the president presides over commemorations of war heroes, throws out the first pitch at baseball games, and attends funerals of world leaders, among other duties.
Kim Jong-un is the current leader of north korea.