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Parliamentary systems: Head of government is elected or nominated by and accountable to the legislature
Constitutional monarchy with a ceremonial monarch
Parliamentary republic with a ceremonial president
Presidential system: Head of government (president) is popularly elected and independent of the legislature
Presidential republic
Hybrid systems:
Semi-presidential republic: Executive president is independent of the legislature; head of government is appointed by the president and is accountable to the legislature
Assembly-independent republic: Head of government (president or directory) is elected by the legislature, but is not accountable to it
Other systems:
Semi-constitutional monarchy: Monarch holds significant executive or legislative power
Absolute monarchy: Monarch has unlimited power
One-party state: Power is constitutionally linked to a single political party
Military junta: Committee of military leaders controls the government; constitutional provisions are suspended
Provisional government: No constitutionally defined basis to current regime
Dependent territories or places without governments
Note: this chart represents the de jure systems of government, not the de facto degree of democracy.
A directorial republic is a country ruled by a college of several people who jointly exercise the powers of a head of state and/or a head of government.