expedition to survey the Great Basin, entered the Sacramento Valley in December 1845. The battalion also included Canadians, English, French, Italians, Poles, Scots, Spaniards, Swiss, and Mexican people, many of whom were members of the Catholic Church. Senate made two modifications: changing the wording of Article IX (which guaranteed Mexicans living in the purchased territories the right to become.S. 41 Political divisions edit Political divisions inside Mexico were another factor in the US victory. Second Battle of Tabasco edit See also: Second Battle of Tabasco On June 13, 1847, Commodore Perry assembled the Mosquito Fleet and began moving towards the Grijalva River, towing 47 boats that carried a landing force of 1,173. "House Journal, 30th Session (1848).