Every U.S. President Ranked by IQ

William McKinley was thoughtful, studious, and well-organized. He attended Allegheny College and later studied law, developing a methodical mind and strong sense of reasoning. Known for his calm demeanor and sharp memory, he was more of a careful analyst than a bold visionary, valuing preparation and precision in every decision.

McKinley’s intelligence showed in his grasp of economics and his steady, calculated leadership during rapid industrial growth. He guided the nation through the Spanish-American War and managed monetary reform with quiet confidence. His intellect expressed itself through patience and prudence rather than philosophical depth.