“I Have a Dream” is a 17-minute public speech by Martin Luther King, Jr. delivered on August 28, 1963, in which he called for racial equality and an end to discrimination. The speech, from the steps of the Lincoln Memorial during the March on Washington for Jobs and Freedom, was a defining moment of the American Civil Rights Movement. Delivered to over 200,000 civil rights supporters, the speech was ranked the top American speech of the 20th century by a 1999 poll of scholars of public address. According to U.S. Representative John Lewis, who also spoke that day as the President of the Student Nonviolent Coordinating Committee, “Dr. King had the power, the ability, and the capacity to transform those steps on the Lincoln Memorial into a monumental area that will forever be recognized. By speaking the way he did, he educated, he inspired, he informed not just the people there, but people throughout America and unborn generations.”
At the end of the speech, King departed from his prepared text for a partly improvised peroration on the theme of “I have a dream”, possibly prompted by Mahalia Jackson’s cry, “Tell them about the dream, Martin!” He had first delivered a speech incorporating some of the same sections in Detroit in June 1963, when he marched on Woodward Avenue with Walter Reuther and the Reverend C. L. Franklin, and had rehearsed other parts.
Source: Democratic Underground