How is Equiano rhetorically effective in his narrative?

Rhetoric is the art of persuasion through language. This includes appeals to emotion and logic, representation of the author’s character, as well as the targeting of the concerns and desires of the audience. How do you feel Equiano approached his audience? Who do you think he was writing for: those already disposed against slavery, those who were okay with slavery, and/or those who felt it was the right and proper delineation of groups of people and labor? What kinds of arguments does he use against slavery as an institution: economic, religious, emotional (or others)? Why do you think his narrative became as important and influential as it did?