Nueva Galicia was a region of New Spain. It was named after Galicia in Spain. Nueva Galicia's territory became the present-day states of Aguascalientes, Colima and Jalisco, and parts of the neighbouring states of Durango, Guanajuato, Michoacán, Nayarit and Zacatecas.
Spanish exploration of the area began in 1531 with Nuño Beltrán de Guzmán's expedition. He named the main city founded in the area Villa de Guadalajara after his birthplace and called the area he conquered the sonorous "la Conquista del Espíritu Santo de la Mayor España" ("The Conquest of the Holy Spirit of Greater Spain"). The name was not approved. Instead Queen Joanna, at the moment the acting regent of Spain, named the area "el Reino de Nueva Galicia."
Gúzman's violent conquest left Spanish control of the area unstable, and within a decade full war had reemerged between the settlers and the Native peoples of the area. The Mixtón War, which lasted from 1540-1541, pitted an alliance of Coras, Gauchichiles and Caxcans against the settlers. Nine years later the Chichimeca War broke out, this time pitting mostly Zacatecos against their former allies, the Caxcan, who had now allied with the Spanish. Nahuas from the Valley of Mexico moved into the region along with the Spanish as the area was settled. In the last decades of the sixteenth century Huichols also arrived.
Given the growing wealth of the region with the discovery of silver to the north, especially in Nueva Vizcaya, Guadalajara became the seat of the second mainland Audiencia of New Spain in 1548. The Audiencia of Guadalajara had oversight of all the northern mainland provinces of the Viceroyalty.
In the late 18th century, as part of the Bourbon Reforms, an Intendancy was established in Guadalajara. In 1824, after Mexican independence was consolidated, the kingdom was transformed into the State of Jalisco and the Territory of Colima.