Final answer:
Montesquieu's ideas about separation of powers influenced the U.S. Constitution.
Step-by-step explanation:
The Enlightenment thinker whose ideas about separation of powers heavily influenced the framing of the U.S. Constitution was Montesquieu. Montesquieu's theory of separation of powers advocated for dividing the government into three branches: legislative, executive, and judicial. This principle is reflected in the structure and powers of the U.S. government outlined in the Constitution.
Learn more about Montesquieu's influence on the U.S. Constitution