Answer:
Essentially, Douglass uses the Fourth of July, when Americans celebrate their independence and their freedoms, to illustrate what he says is the "immeasurable distance" between enslaved people and the rest of Americans. He juxtaposes the ideals of America, celebrated on the Fourth, with the reality of slavery. He must have felt relieved and glorious about it.
These words have similar meanings, so the relationship between them is that they are "synonyms". Synonyms are words with similar meanings, and they can often be used interchangeably within a sentence. Other relationships could include antonyms, which are words with opposite meanings.
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