 He defeated a corrupt Democratic machine, presided during the Depression and world war, made the city the model for New Deal welfare and public works programs, and championed immigrants and ethnic minorities.He succeeded with the support of a sympathetic president who was equally hostile to Tammany Hall.He secured his place in history as a tough-minded reform mayor who helped clean out corruption, bring in gifted experts, and fix upon the city a broad sense of responsibility for its own citizens.