Answer:
La Venta, the eastern center, is near the rich estuaries of the coast, and also could have provided cacao, rubber, and salt. San Lorenzo, at the center of the Olmec domain, controlled the vast flood plain area of Coatzacoalcos basin and riverline trade routes.
Explanation:
http://www.lessonsite.com/ArchivePages/HistoryOfTheWorld/Lesson11/Olmec%20Civilization.htm
