The city is known as the premier wool textile center in the country, specializing in thread and yarn, cashmeres, blankets, as well as embroidered blouses and skirts During the pre-Hispanic era, this area produced cotton textiles, especially in the mountain areas of Huehuetla and Tenango. These were part of the tribute items collected by the Aztecs. Textile production continued into the colonial period, especially to mining communities in the Real del Monte and Pachuca areas. Sometime during this period, the fabric produced switched to mostly wool. During the late 19th and early 20th centuries, the textile industry here and in the rest of Mexico was modernized and the first train station was opened to ship products. The Mexican Revolution disrupted train service and the textile industry here suffered but came back after the war was over led by the La Esperanza and Santiago Textil factories, and with about 21% of the wool fabric of the country produced here. The textile industry continued to develop with the production of dairy products becoming important as well.