The President is the head of the society in the USA. The governing bodies are: White House, Dept of Commerce, Dept of Homeland Security, Dept of Transportation, Environmental Protection Agency, Food and Drug Admin, Federal Maritime Commission, Dept of State, Nat. Oceanic and Atmospheric Admin, US Congress: (Senate and House of Rep.)
Leadership is obtained through the people voting the person into office. Most US elections candidates are elected directly by citizens, however, the president and vice president they're chosen by electors through the electoral college.The Legislative Branch (Senate and House of Rep) makes the laws the Executive Branch (President) enforces the laws.
Democracy is the system of government by which the whole population or the eligible members of each state are voted in through elected representation. The people have a powerful voice in democratic countries. Society is structured based on social classes based on wealth, occupation, income, education or fame.