Why did Montesquieu want the government structure to have three branches?

Montesquieu advocated for a government structure with three branches—executive, legislative, and judicial—to prevent any one branch from gaining too much power and to ensure a system of checks and balances. He believed that this separation of powers would promote political liberty and protect individual freedoms by creating a framework where each branch could limit the others' actions. This idea was foundational in shaping modern democratic systems, as it aimed to prevent tyranny and uphold justice.