Answer:
Republic
Unitary state
Presidential system
Constitutional republic
Parliamentary republic
Explanation:
REPUBLIC:
A republic (Latin: res publica, meaning "public affair") is a form of government in which "power is held by the people and their elected representatives". In republics, the country is considered a "public matter", not the private concern or property of the rulers.
UNITARY STATE:
Form of government
A unitary state is a state governed as a single entity in which the central government is ultimately supreme. Unitary states stand in contrast with federations, also known as federal states.
PRESIDENTIAL SYSTEM:
A presidential system is a form of government in which a head of government (president) leads an executive branch that is separate from the legislative branch. This head of government is in most cases also the head of state.
CONSTITUTIONAL REPUBLIC:
A constitutional republic is a state where the chief executive and representatives are democratically elected by the people, and the rules are set down in a written constitution. The head of state and other representatives are elected but they do not have uncontrolled power.
PARLIAMENTARY REPUBLIC:
A parliamentary republic is a republic that operates under a parliamentary system of government where the executive branch (the government) derives its legitimacy from and is accountable to the legislature (the parliament). There are a number of variations of parliamentary republics.
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