Final answer:
Before his presidency, Herbert Hoover served as the Secretary of Commerce and was noted for his humanitarian and relief efforts. As president, he championed the concept of rugged individualism, promoting minimal government intervention in the economy and individual autonomy in achieving success.
Step-by-step explanation:
Prior to becoming president, Herbert Hoover served as the Secretary of Commerce under Presidents Harding and Coolidge. In this role, he was noted for his humanitarian efforts and proficiency in governmental affairs. He became renowned for coordinating relief efforts during the Boxer Rebellion in 1900 and for leading the food relief effort in Europe during World War I. His leadership of the U.S. Food Administration under President Wilson was instrumental in coordinating rationing efforts and securing essential food supplies for Allied forces and European citizens.
As president, Hoover championed the concept of rugged individualism the most vigorously. This belief promoted the idea that Americans could attain success or face failure on their own merits with minimal government intervention. Hoover's philosophy reflected the optimism and prosperity of the 1920s, and he hoped to continue the 'Coolidge prosperity' through policies that reduced federal economic regulations.