Final answer:
Martin Luther King Jr. used the phrase 'let freedom ring' to symbolize his vision of racial equality in the 'I Have a Dream' speech.
Step-by-step explanation:
When Martin Luther King Jr. said “let freedom ring” in his famous 'I Have a Dream' speech, he was using a powerful metaphor to symbolize his vision of racial equality and justice. The phrase originates from the traditional African American spiritual song 'My Country, 'Tis of Thee,' also known as 'America.' In the speech, King uses the repetition of 'let freedom ring' to emphasize the need for freedom and equality for all Americans, regardless of their race or ethnicity.
Learn more about Martin Luther King Jr. and the 'I Have a Dream' speech