At the time of signing, what was the title of the man who is the first of the two names in the name of the 1901 treaty that nullified the clayton-bulwer treaty?

The Clayton-Bulwer Treaty was signed by the U.S and Britain in April, 1850 being John M. Clayton and Sir Henry Lytton Bulwer the men who negotiated.  The Hay–Pauncefote Treaty signed in 1901 replaced the Clayton–Bulwer Treaty also negotiated by John Milton Hay, secretary of State of the U.S.

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