The 2.2-mile-long valley in Las Animas County northwest of Trinidad carrying the derogatory “Chinaman” term should be renamed, Colorado’s Geographic Naming Advisory Board unanimously voted Thursday. Board members accepted a proposal to change Chinamans Canyon to Toisan Canyon — a province in southern China where a majority of Chinese immigrants who came to the United States in the 1800s hailed from, many of them working on railroads and in mines across the country, the application for the name change stated. Peggy Lore, representing Colorado Asian Pacific United, submitted the proposal to “recognize the Chinese who were an integral part of the history of Colorado but who, with few exceptions, have remained faceless and nameless,” according to the proposal. Her proposal, submitted Feb.