Final answer:
Margaret Thatcher likely used rhetorical devices such as metaphors, similes, anaphora, and pathos in her remarks on Reagan's death, as well as punctuation to provide emphasis, just as poets like Phyllis Wheatley did in their literary works to enhance meaning.
Step-by-step explanation:
The rhetorical devices used in Margaret Thatcher's remarks on Ronald Reagan's death can be unveiled by analyzing her speech for elements such as metaphors, similes, alliteration, anaphora (the repetition of a word or phrase at the beginning of successive clauses), and pathos (an appeal to emotion). For instance, she might have employed pathos to evoke a sense of sorrow and respect for Reagan, creating an emotional connection with her audience. Additionally, she may have used anaphora to reinforce key themes of her message. These devices, among others, work to enhance the persuasiveness and memorability of her elegy.
Considering the excerpt provided where it's mentioned that the poet used diacritical marks to highlight the power of words, one can infer that these marks were also a deliberate choice to emphasize certain parts of her message, much like rhetorical devices. While the provided information seems to be referring to Phyllis Wheatley, a historic poet, rather than Thatcher, the same principles of using punctuation and formatting for emphasis would apply in Thatcher's speech.