Vom Geist der Gesetze
Charles de Secondat, baron de Montesquieu (1689–1755) was a social commentator and political philosopher. His theories deeply influenced the American Founders. His belief that the state powers be separated into legislative, executive, and judicial branches formed the basis for separation of powers under the United States Constitution. In "The Spirit of the Laws", Montesquieu outlined the view that man and societies are influenced by climate. He believed that hotter climates create hot-tempered people and colder climates aloof people, whereas the mild climate of France is ideal for political systems. This theory may possibly have been influenced by similar sentiment expressed in "Germania", an ethnographic writing by Tacitus, a writer frequently studied by Montesquieu.