When did Martin Luther King Jr. give the I Have a Dream speech?

The March on Washington drew around 250,000 people to the National Mall on 28 August 1963, making it one of the largest political rallies in US history at the time. Martin Luther King Jr. was the final speaker of the day, and his 17-minute address is remembered for its improvised closing section beginning with I have a dream. Gospel singer Mahalia Jackson reportedly urged him to tell them about the dream, prompting him to leave his prepared text. The march helped build momentum for the Civil Rights Act of 1964 and the Voting Rights Act of 1965. King received the Nobel Peace Prize in 1964, becoming its youngest winner at the time at age 35.