Martin Luther King Jr. delivered his iconic "I Have a Dream" speech on August 28, 1963 in Washington D.C. during the March on Washington for Jobs and Freedom. In his speech, King envisioned a future where all people would be judged not by the color of their skin but by the content of their character, and called for an end to racism and racial inequality. King's powerful message of freedom, justice and racial harmony inspired the civil rights movement and had a profound impact on American society.