One topic that you can use is: In the " letter of " Birmingham Jail" King points out that he is not an outsider since the people of Birmingham invited him. And then your Explanation would be: King is letting the clergy members understand his role in what is going on during their time.
"I Have a Dream" was a speech delivered by American civil rights activist Martin Luther King Jr. on August 28, 1963, during the March on Washington for Jobs and Freedom. In this speech, he calls for an end to racism in the United States and demands civil and economic rights for black people in the USA. This speech was heard by at least 250,000 civil rights supporters.
Thus, this could be the answer.
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