Final answer:
Warren G. Harding won the presidency by promoting a 'return to normalcy', appealing to Americans' desires to revert to pre-war conditions away from Progressive reforms and international involvement.
Step-by-step explanation:
Warren G. Harding won the presidency by appealing to Americans' desire to return to life as it was before the war. After the first World War, American society experienced significant turmoil including the flu pandemic, economic struggles, and political tensions. Harding's platform promised a 'return to normalcy', which resonated with voters who were exhausted by the events of the past years and wished to retreat from Progressive reforms and international engagements. Harding's presidency began the era of the Jazz Age, a time characterized by a pro-business government and a reduction in social Progressivism, aligning with the voters' desires for personal freedoms and less government interference.