The correct answer to this open question is the following.
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The opinion I have about Dr. Martin Luther King Jr. is that he was the most important civil rights leader in the United States.
I think that both, "Letter from a Birmingham Jail" and "I Have a Dream," show the pinnacle of his ideas and works as a civil rights leader, being the last one, the most famous speech of the civil rights era.
One of the most important characteristics attributed to Martin Luther King was his non-violent approach to protests. Something he learned from Mahatma Gandhi.