In the 18th century, the Spanish Crown authorized the establishment of Fairs along the Camino Real to promote commerce (although some form of these had already been existing for some time prior). Some of the most important Fairs along the Camino Real included the "Fair de San Juan de los Lagos" in Jalisco, the "Fair de Saltillo", and the "Fair de Chihuahua", which was of great importance to Nuevo México merchants. The "Fair de Taos" was also an important annual event where the Comanches and the Utes traded weapons, ammunition, horses, agricultural products, furs, and meats with the Spanish. Spain at the same time maintained a monopoly on the products of its northern provinces, thus no trade occurred with the French colony of Louisiana.