1 янв 100 г. до нашей эры - Weird end to Olmec society

Описание:

They destroyed their ceremonial centers and left. Some scholars think invaders might have destroyed them, but most agree that the Olmecs probably intentionally ruined them. Why's anyone's guess.
Some options: public dissatisfaction with ruling system; civil unrest.

(I'm a little conflicted, bear with me: my book says at one point that Olmec society ended at 400 B.C.E., but then two paragraphs later it says 100 B.C.E., so I don't know which one it is. Since it says 100 B.C.E. twice and 400 B.C.E. once, I'm gonna go with the former, but keep this in mind, I guess)