How did Charles de Montesquieu contribute to the growth of self government?

Charles de Montesquieu significantly contributed to the growth of self-government through his influential work "The Spirit of the Laws," where he introduced the idea of the separation of powers within government. He argued that dividing government authority into distinct branches—executive, legislative, and judicial—would prevent tyranny and promote liberty. His ideas inspired democratic principles and constitutional design, particularly influencing the framers of the U.S. Constitution. By advocating for checks and balances, Montesquieu laid the groundwork for modern democratic governance.