Final answer:
The rhetoric used most in the excerpt is an appeal based on the author's character, with the author's involvement in the Chicano movement lending credibility to their argument. There are also elements of emotional appeal and efforts to use inclusive language to communicate cultural ideas.
Step-by-step explanation:
In the provided excerpt, the author utilizes rhetoric that is predominantly an appeal based on the author’s character (ethos) to persuade the reader. The writer describes his extensive experience as a published author and his involvement in the Chicano movement, which adds credibility and authority to his conclusion regarding the inclusion of cultural elements in American literature. There is also an appeal based on emotion (pathos) as the author expresses a sense of forced conclusion, suggesting a reluctance to leave out cultural elements despite his belief in their importance. Lastly, there is an emerging use of inclusive language to communicate cultural ideas and a reflection on the need to meet or challenge conventional expectations in a rhetorically effective manner.