The best summary from the answer choices is "Conditions for Black Americans weren't that great, but they've gotten worse," as stated in option D.
A summary is a shorter version of a text containing only its most important ideas. Let's analyze the text provided in the question and list the most important topics found in it so that we can choose the best summary:
After analyzing the topics above, we can conclude that the best summary is found in option D. "Conditions for Black Americans weren't that great, but they've gotten worse." Here, all that is most important in the text is mentioned, but in a shorter, briefer manner.
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