In the old age the world relied on kingdoms to rule the countries. The country was passed down generations in the family with the eldest taking the reign. This is still the basis of many countries and many nations are following this law until there is war and a new king is elected.
However, some years ago, certain countries aimed for a universal leader. Someone who was made a representative by the unified decision of the nation. And so, democracy was born. It was first introduced by the United States of America. Since then, many other countries have followed this law and introduced democracy in their countries too.