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As a result of Mexico City's central role in the colonial administration of New Spain, the population of the city included relatively large numbers of speakers from the centre of the Spanish Empire, Castilla in Central Spain. Mexico City (Tenochtitlán) had also been the capital of the Aztec Empire, and many speakers of the Aztec language Nahuatl continued to live there and in the surrounding region, outnumbering the Spanish-speakers for several generations. Consequently, Mexico City tended historically to exercise a standardizing effect over the entire country, more or less, evolving into a distinctive dialect of Spanish which incorporated a significant number of hispanicized Nahuatl words.