Douglass' most efficient purpose is to show that there is no freedom in America, followed by the purpose of showing that there is a great inequality between him and his listeners, followed by the purpose of showing that the celebration of American freedom is hypocritical.
We can arrive at this answer because:
To reinforce all the arguments Douglass shows evidence talking about the life of slaves, the oppression to which they are subjected, and the white population's refusal to give freedom to all.
This question is about the speech "What to the Slave Is the Fourth of July?"
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