Territorio de Oregón
On 28 July 1846, while a canon in Montreal, A.M.A. Blanchet was appointed bishop of the new Diocese of Walla Walla in the Oregon Country (now in the U.S. state of Washington). Blanchet was to follow his brother, who had gone to the Oregon Country in 1838 to set up a Catholic church presence there, and was the bishop of the Diocese of Oregon City (now the Archdiocese of Portland).