A large majority of Mexicans have been classified as "Mestizos", meaning they have both Spanish and indigenous Mesoamerican ancestry. However, in modern Mexican usage, mestizo identity is more ideological than ethnic. Being Mestizo means identifying with Mexico's idiosincratic culture and heritage which is neither fully Spanish nor fully indigenous. By the deliberate efforts of post-revolutionary governments the "Mestizo identity" was constructed as the base of the modern Mexican national identity, through a process of cultural synthesis referred to as "mestizaje" . Mexican politicians and reformers such as José Vasconcelos and Manuel Gamio were instrumental in building a Mexican national identity upon this concept.