Final answer:
Presidents have influenced Thanksgiving celebrations in America through their speeches, actions, and use of media.
Step-by-step explanation:
The presidents of the USA have had an impact on the way Americans celebrate Thanksgiving today through their speeches and actions. For example, President Bill Clinton comforted and encouraged the families affected by the Oklahoma City bombing, reminding the nation to stand against violence and promote good acts.
Additionally, presidents have used television and modern media to reach the public and shape their perspectives on Thanksgiving celebrations. Through these means, presidents have influenced the unity, values, and messages associated with Thanksgiving in American society.