Why was his writting so powerful and effective?

Though initially begun for a specific purpose, the letter that Dr. Martin Luther King Jr. wrote while incarcerated in Birmingham ultimately addressed universal questions of freedom and inequality. It is because of its ambitious reach that “Letter from Birmingham Jail” has remained such an enduring document, arguably one of the most important American works of theology or philosophy. His letter stirred the hearts and conscience of people from all faiths and nationalities. King forcefully addressed truths about life, respect, and human right for not just blacks, but for all people who faced injustice in the world.

Write a paragraph analyzing how King uses structure in his letter?

King forcefully addressed truths about life, respect, and human right for not just blacks, but for all people who faced injustice in the world. That's what's powerful and also effective.