The correct answer is C) He encouraged poor and mixed-race people to fight for freedom in New Spain.
One important accomplishment of Miguel Hidalgo y Costilla was "He encouraged poor and mixed-race people to fight for freedom in New Spain.
Miguel Hidalgo's "Grito de Dolores" called for Mexico to rise against the Spanish for independence and racial equality. Hidalgo's "Grito de Dolores" represented the beginning of the Mexican Independence Movement. This event was held in Dolores, Hidalgo, on September 15, 1810. The "Criollos" (Creoles) organized the movement and invited the Native Indians to sum forces to fight against the Spanish troops in New Spain. Other great Mexicans such as José María Morelos y Pavón, Vicente Guerrero, and Agustín de Iturbide participated in the rebellion.