Which book has proposed a division of power with in government?

"The Federalist Papers," particularly Federalist No. 51, proposed a division of power within government, advocating for a system of checks and balances. Written by James Madison, Alexander Hamilton, and John Jay, these essays argued for the separation of powers among the legislative, executive, and judicial branches to prevent any one branch from becoming too powerful. This foundational concept has greatly influenced the structure of modern democratic governments, particularly in the United States.