At the end of the 19th century, Mexico City grew east with the establishment of Colonia Morelos, Colonia Penitenciaría and Romero Rubio. Most of the development was working class housing and industrial facilities. Most of the industries were initially connected with food processing and other activities related to the La Merced and Jamaica markets. This would bring the city's limits to Eduardo Molina and Avenida Congreso de la Unión by the beginning of the 20th century. Avenida Circunvalación, next to the La Merced Market, still connected to the La Viga Canal. What is now the borough then belonged to two districts: Mexico City proper and the municipality of Guadalupe Hidalgo.