Hermosillo , formerly called Pitic (as Santísima Trinidad del Pitic and Presidio del Pitic) is a city located centrally in the northwestern Mexican state of Sonora. It is the capital and largest city as well as the main economic center for the state and region. It contains almost all of the state's manufacturing and has seventy percent of its population. The major manufacturing sector is automobiles, which was begun in the 1980s, when Ford built the Hermosillo Stamping & Assembly Plant.