Final answer:
The central idea linking Silverstein, Goldstein, and Arndt's letters is their analytical approach to thematic exploration and interconnected ideas across texts. This is exemplified in discussions of women's rights, educational appeals, economic analogies, and historical defense of labor which demonstrate rhetorical effectiveness and evolving arguments.
Step-by-step explanation:
The central idea that links Silverstein, Goldstein, and Arndt's letters is their analytical approach to different subjects within an overarching theme, which emphasizes the significance of interconnected ideas, themes, and arguments across texts. In these examples, the authors provide insights into topics such as women's rights, literary analysis on symbolism, emotional appeals for education, differences in economic systems, and a historical defense of working Americans. This analytical connection across texts can be seen in Garrison's thesis where she connects the topic of women's rights with significant texts, Peterson's emphasis on emotional appeals in the context of education, and Verdery's analogy to highlight economic systems. Together, these show how one idea can support or refute another and how arguments can evolve over time to address contemporary issues, which in turn resonates with the audience. Lastly, the letters also showcase how rhetorically effective ways are used in writing to meet or challenge conventional expectations.