The Constitution of the United States: Article IV, The States
Section 4 - Republican government
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
Query:From Wikipedia:A republic is a form of government in which the people or some portion thereof retain supreme control over the government, and in which the head of government is not a monarch.What are some advantages and disadvantages of being a republic?