Answer;
The Olmecs were the earliest known major Mesoamerican civilization. Following a progressive development in Soconusco, they occupied the tropical lowlands of the modern-day Mexican states of Veracruz and Tabasco. It has been speculated that the Olmecs derived in part from the neighboring Mokaya or Mixe–Zoque cultures. Wikipedia
Dates: c. 2,500 - 400 BCE
Major sites: La Venta, Tres Zapotes, Laguna de los Cerros
Period: Preclassic Era
Followed by: Epi-Olmecs
Geographical range: Veracruz, Mexico