For most of the 1840s, he devoted himself primarily to writing the history of Mexico from the perspective of a conservative. His three-volume work "Disertaciones sobre la Historia de la Republica mexicana" (Mexico, 1844–1849) and his five-volume "Historia de México, desde los primeros movimientos que prepararon su independencia en el año de 1808, hasta la época presente" (Mexico, 1849–1852), stand as the major intellectual productions of the Conservative Party in nineteenth-century Mexico, and the only histories produced by a Mexican author of his era to view the Spanish presence in his country favorably.