Final answer:
The highlighted excerpt from Plessy v. Ferguson demonstrates Harlan's prediction about the impact of segregation laws.
Step-by-step explanation:
The subject of this question is History and it is at the High School level.
The highlighted excerpt from Plessy v. Ferguson, 1896 demonstrates Harlan's prediction about the impact of segregation laws by highlighting the negative consequences of such laws. Harlan argues that state enactments which treat colored citizens as inferior and degrade them, by not allowing them to sit in public coaches occupied by white citizens, create and perpetuate a feeling of distrust and arouse race hate between the races. Harlan suggests that these laws plant the seeds of race hate and should not be permitted under the sanction of law.
Therefore, Harlan's prediction about the impact of segregation laws is most clearly demonstrated in this highlighted excerpt.
Learn more about The impact of segregation laws