effective by Newcomer. In February 1954, a new two-wing addition to Rainbow City Elementary School was inaugurated, relieving previous overcrowding. This addition was based on the same design as the new elementary school for the US-rate town of Margarita, which had also faced increased demand. Rainbow City was the Canal Zone's largest civilian townsite. In the November 1954 census, Rainbow City's population was counted at 4,845, of which 55% were children. There were more children in Rainbow City than the combined total populations of the white townsites of Margarita and New Cristobal. Rainbow City / Arco Iris, RP Rainbow City was one of the first Canal Zone areas to revert to the Republic of Panama in accordance with the 1977 Panama Canal Treaties. Even before the 1979 reversion, many of Rainbow City's residents began migrating to the United States, particularly to New York City. Many others also moved to Panama City as economic conditions in Colón worsened considerably and job opportunities with the Panama Canal grew more limited. After the 1979 reversion, the township's name was changed to Arco Iris, the Spanish translation of "Rainbow", and a name which the area retains to this day. References The Panama Canal Review, "New Silver City Swimming Pool Is Rapidly Nearing Completion," Panama Canal Company, February 2, 1951. The Panama Canal Review, "Residents Of Silver City Will Vote On New Official Name Of Their Town," Panama Canal Company, April 4, 1952 The Panama Canal Review, "Governor Officially Names Rainbow City After Overwhelming Vote Of Residents," Panama Canal Company, May 2, 1952 The Panama Canal Review, "Your Town Rainbow City," Panama Canal Company, September 2, 1955 Panama Canal Zone Townships Colón, Panama