match up with the grids of the former towns Analco and San Juan de Dios, across the river from central Guadalajara on the eastern side of Rio San Juan de Dios (Rio San Juan de Dios is now underground; it runs beneath Calzada Independencia). When the railway was introduced to Guadalajara in 1888, the southern part of the city began development, and its streets aligned with the grid to the east of the old Rio San Juan de Dios. Additional 20th-century expansion of the city introduced even more variety, as developers introduced different kinds of non-grid street plans in new areas. During the government of José de Jesús González Gallo, between 1947 and 1953, major public works changed the urban landscape of the historic center of the city. Major controversial projects included the widening of Avenida 16 de Septiembre and Avenida Juárez, which were no longer adequate to handle car traffic in the center of the city. In the process, many buildings of architectural and historical value were demolished. Historical buildings around Guadalajara Cathedral were also demolished to leave large open spaces on the four sides of the Cathedral in the form of a large Latin cross, in which the cathedral is now centered. There were other, somewhat less controversial, projects to improve the flow of traffic and increase commerce in other parts of the city. Districts Guadalajara is made up of more than 2,300 colonias (neighborhoods) in the Metropolitan Area. The oldest parts of the city include Centro (the oldest in the city), Santuario, Mexicaltzingo, Mezquitan, Analco, and San Juan de Dios. Private houses in the oldest sector of the city are mostly made up of one- and two-level houses, with architectural styles ranging from simple colonial architecture to the Churrigueresco, Baroque, and early nineteenth century European styles. Just west of the oldest part of the city are upper-class colonias built in the nineteenth and early twentieth century, containing the neoclassical structures and houses of the Porfiriato. In the 1920s, 1930s, 1940s and 1950s well-to-do Tapatios expanded into colonias Lafayette, Americana, Moderna, and Arcos Vallarta. New architectural trends of the 1960s and 1970s also left their mark in colonias such as Colonia Americana, Vallarta Poniente, Moderna, Providencia, Vallarta San Jorge, Forest Gardens, and Chapalita. The Metropolitan Area has more wealthy neighborhoods than any other part of western Mexico. These colonias are located both inside and outside the municipality of