Question: Landon T. Clay (born Landon Thomas Clay) was an American businessman and founder of the Clay Mathematics Institute (CMI),  a private, non-profit foundation, based in Peterborough, New Hampshire, in which country?
Sentence (from "Clay Mathematics Institute"): The Clay Mathematics Institute (CMI) is a private, non-profit foundation, based in Peterborough, New Hampshire, United States.
Relevant evidence: Yes