Answer:
The author's purpose is to allow, through the allusions, the public to be able to link the information presented in the letter with information of general knowledge.
Explanation:
The allusion is a figure of speech that allows an author, in his text, to make references to other texts, books, people, events and places. Dr. King, uses a lot of allusions in "Letter to Birmingham Jail." These allusions make reference to biblical and religious figures, political writers and great activists. King does this to allow readers to associate the information presented in his text with information known to the general public, allowing the subject he is promoting in the text to be better understood by the public.
