Answer: The excerpt from the speech that best supports this topic sentence is "One hundred years later, the Negro is still languished in the corners of American society and finds himself an exile in his own land".
Step-by-step explanation: Martin Luther King's "I Have a Dream" highlights the importance of ending with racism. The speaker makes reference to the suffering that African Americans have experienced for many years and that still continue to endure. He includes a metaphor to show this idea when he says that "One hundred years later, the Negro is still languished in the corners of American society and finds himself an exile in his own land". The word "languished" shows that African Americans have suffered neglect, while the phrase "in the corners of American society" indicates that they have been continuously excluded and segregated. Therefore, this is the excerpt that best supports Hector's topic sentence.