Who is MOST responsible for the structure of U.S. branches of government Aristotle hobbes Locke or montesquieu?

Montesquieu is most responsible for the structure of the U.S. branches of government. His work "The Spirit of the Laws" introduced the idea of separating government powers into distinct branches—executive, legislative, and judicial—to prevent tyranny and protect liberty. This concept heavily influenced the framers of the U.S. Constitution, establishing a system of checks and balances that is foundational to American governance.