William McKinley – lifetime politician after the military
Theodore Roosevelt – adventurer and politician
William Howard Taft – Lawyer, judge, politics
Woodrow Wilson – Lawyer, academic, then politics
Warren G. Harding – Newspaper publisher/owner, politician
John Calvin Coolidge, Jr. – Lawyer then politics
Herbert Clark Hoover – mining engineer, humanitarian, business man, politician
Franklin Delano Roosevelt – lifetime politician
Harry S. Truman – military, failed businessman, politician
Dwight D. Eisenhower – Lifetime military before the presidency
John F. Kennedy – Lifetime politician after the military
Lyndon B. Johnson - Businessman/ politician then full time politician with a brief military stint
Richard M Nixon – Lawyer and then lifetime politician with a brief military stint
Gerald Rudolph “Jerry” Ford, Jr – Lifetime politician after the military
James Earl “Jimmy” Carter, Jr. – Military, businessman/farmer, politician
Ronald Wilson Reagan – Actor then politician
George H W Bush – Brief military, business, then politician
William Jefferson Clinton – Lawyer, lifetime politician
George W Bush – businessman/politician then full time politician
Barack Hussein Obama – Community organizer, lifetime politician
There doesn’t seem to be a whole lot of correlation between successful presidencies and business experience.
Harding, Hoover, Truman, Johnson, Carter and the two Bushes all had some business background with mixed successes in business and politics.
In some cases the political connections helped businesses. The three Texas guys - Johnson and the two Bushes.
The worst president of the lot probably was probably Harding, the newspaper publisher who sold his successful paper for $500,000.
The best president may have been Truman who famously failed at haberdashery.
Hoover failed in business mainly due to the faults of others and “failed” in the presidency mainly due to terrible circumstances. A very honorable man who has been treated too harshly in history, IMO.
Carter’s reasonably successful business was hurt a bit by segregationist boycotts after he became a moderate governor of Georgia. He was probably a better businessman than president.