Final answer:
Dr. King's purpose in writing his 'Letter From a Birmingham Jail' was to defend the strategy of nonviolent protest.
Step-by-step explanation:
Dr. King's purpose in writing his 'Letter From a Birmingham Jail' was to defend the strategy of nonviolent protest. In the letter, King responds to white Alabama clergymen who criticized the Southern Christian Leadership Conference's tactics and argued for gradual social change. He argues that nonviolent protest is necessary for achieving justice and equality for all Americans. By using examples from history, such as the long wait for civil rights, King makes a compelling case for the urgency and effectiveness of nonviolent protest in the pursuit of racial equality.