AUGUST 28, 1963: Martin Luther King, J. delivers his famous “I Have a Dream” speech to more than a quarter million people from the steps of the Lincoln Memorial in Washington, D.C. The national mall was filled that hot August day with thousands who had taken part in the March on Washington or Jobs and Freedom, and King’s speech set out to place their struggle in a larger context of history, calling on passages from the Declaration of Independence and the Bible. When Mahalia Jackson exhorted him to “Tell them about the dream, Martin!” King set aside his prepared text to deliver what would become the speech’s most stirring calls for justice, words that became a defining moment in the civil-rights movement. VIEW SLIDESHOW: "I Have a Dream" Speech