Her denial helped make history (3)

I believe the answer is:

his

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But I can't explain it at all! Could you help me understand?

(Other definitions for his that I've seen before include "To - Coy Mistress (Marvell)" , "that chap's" , "Belonging to that man" , "Belonging to the male" , "That man's" .)

I've seen this clue in the Evening Standard.

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