The document summarizes the origins and growth of the calico industry in Barcelona, which helped drive industrialization in the region. It describes how the first steam-powered factory was introduced in Barcelona in 1833, sparking the industrial revolution in Spain. As industries grew, they began moving outside the city walls to municipalities on the Plain of Barcelona like Sant Marti, El Poblenou, and Sants. By the late 19th century, Barcelona had experienced a transformation with the growth of industries and factories across the city and merging of surrounding towns.