That would be called a castle? lol or kingdom.
Awnser: Even though kingsolver’s essay addresses scientific information, her use of dialogue introduces different viewpoints which allows the reader to connect more deeply to the information. Readers relate to the dialogue which gives them a sense of familiarity. She uses an anecdote, which incorporates ideas of god and religious ideas. It advances her purpose because it provides a sense of relation to religion, an apparent concept that many practice. today.
I believe the answer to question two is true. Political writings were usually persuasive.
Hope I helped!