For what reasons does Montesquieu promote the separation of powers

Montesquieu called the idea of dividing government power into three branches the "separation of powers." He thought it most important to create separate branches of government with equal but different powers.

HE believed it would keep the government controlled and limited.

Montesquieu concluded that the best form of government was one in which the legislative, executive, and judicial powers were separate and kept each other in check to prevent any branch from becoming too powerful. He believed that uniting these powers, as in the monarchy of Louis XIV, would lead to despotism.