Answer:
Government
Step-by-step explanation:
A government is a formal state-run institution. Many systems of government exist: democratic, authoritarian, etc. The government of the United States is a democracy, for example, where its residents can start voting to appoint their leaders. The US has a system of government that is the nation's supreme law and everyone, such as the President, has to respect it.
Therefore according to the above explanation, the correct answer is government.