Final answer:
The statement that the speaker and the audience should not be part of the same public is false, as effective communication relies on their interaction within the same sphere. In history, the notion of separate spheres and the Cult of Domesticity reinforced social class distinctions in American society.
Step-by-step explanation:
The concept that the speaker and the audience should not be part of the same public is false. Effective public speaking involves a speaker engaging with an audience within the same public sphere. This dynamic allows for better communication and mutual understanding.
In the context of American history, the statement about the notion of separate spheres and the Cult of Domesticity allowing the American middle class to distinguish themselves as separate from and superior to the working class is true. This notion perpetuated the idea that the middle class had different roles, responsibilities, and status compared to the working class, thereby establishing social hierarchies.