The John N. and Mary L. (Rankin) Irwin House in Keokuk, Iowa, is a historic house that was listed on the National Register of Historic Places in 1999, John N. Irwin, who bought the house and raised his family there with his wife Mary, was a five-term mayor of Keokuk who went on to serve as the territorial governor of the Idaho Territory and the Arizona Territory, are in which country?