The correct answer is - Mexico.
The Mesoamerican civilizations of the Mayans and the Aztecs existed on the territory of what is now Mexico. The Maya and the Aztec civilizations shared some similarities, even though they were civilizations that have a very big time-span between their existence. The Aztecs were influenced in lot of ways by the Mayans, and one of the most important cultural influence was the religion, which was essentially the same.
It is also worth to notice, that both, the Maya and the Aztec civilizations were having their basis in their social structures and culture, in the even earlier Olmec civilization which was existing on the territory of Mexico much earlier in the history.
