According to the passage, why was King\u2019s \u201CI Have a Dream\u201D speech important?

According to the passage, King\u2019s speech was important because it was a defining moment of the American Civil Rights Movement. This statement is supported in the last sentence of the first paragraph. King\u2019s speech occurred a century after the Civil War and Lincoln\u2019s Emancipation Proclamation; therefore, those two options can be eliminated. The speech may have made King famous, but that is not why his speech was important.