It does not say all white men, but it says all men. . how does the second part of the sentence relate to the first part? it clarifies the first part. it makes a claim. it restates the first part. it adds an argument.

The second part of the sentence clarifies the first part.

Explanation: The sentence provided presents the "not A... but B" structure, which consists in a negative clause followed by a positive clause. Moreover, by resorting to this structure, the writer directs the focus of attention towards the second part of the sentence ("but it says all men"), which clarifies the first one. In other words, the second clause makes the first statement more comprehensible by adding more details.