Which philosopher advocated separation of powers to prevent tyranny?

Which philosopher advocated separation of powers to prevent tyranny?

• A. Voltaire
• B. Rousseau
• C. Kant
• D. Montesquieu

Answer: (D)

Separating governmental power into distinct branches is a safeguard against tyranny: when legislative, executive, and judicial powers are held by different bodies, no single group can easily dominate and rule arbitrarily. This arrangement creates mutual checks and balances, so each branch can constrain the others and protect liberty. Montesquieu expressed this idea most clearly in The Spirit of the Laws. He argued that liberty flourishes when power is divided and limited by institutional design, drawing on the British system where Parliament, the Crown, and the courts each have their own roles. By ensuring that no one part of government can unilaterally control all the levers of authority, abuse becomes much harder to achieve. His emphasis on power serving as a check to power influenced many modern constitutions, including the United States. Voltaire, Rousseau, and Kant contributed important Enlightenment ideas—Voltaire on civil liberties and religious toleration, Rousseau on the social contract and the general will, Kant on moral duty and autonomy—but they did not articulate the formal separation of powers as a primary mechanism to prevent tyranny the way Montesquieu did.

Separating governmental power into distinct branches is a safeguard against tyranny: when legislative, executive, and judicial powers are held by different bodies, no single group can easily dominate and rule arbitrarily. This arrangement creates mutual checks and balances, so each branch can constrain the others and protect liberty.

Montesquieu expressed this idea most clearly in The Spirit of the Laws. He argued that liberty flourishes when power is divided and limited by institutional design, drawing on the British system where Parliament, the Crown, and the courts each have their own roles. By ensuring that no one part of government can unilaterally control all the levers of authority, abuse becomes much harder to achieve. His emphasis on power serving as a check to power influenced many modern constitutions, including the United States.

Voltaire, Rousseau, and Kant contributed important Enlightenment ideas—Voltaire on civil liberties and religious toleration, Rousseau on the social contract and the general will, Kant on moral duty and autonomy—but they did not articulate the formal separation of powers as a primary mechanism to prevent tyranny the way Montesquieu did.