After the war, the economy of the state recovered slowly. Between 1940 and 1960, economic progress came more rapidly, with the industrial infrastructure growing and modernizing. During the same period, the population grew substantially as well. Much of industrial growth from then to the present can be seen in the various industrial parks located north of the capital city. In the following thirty years, the city grew to over four times its previous size. However, the state conserved the city’s historic center, which was declared a World Heritage Site in 1996. The city’s official name, which had been changed simply to "Querétaro", was restored to "Santiago de Querétaro" the same year.