Conversation so far:
What encouraged the Huastec people to split from Maya?
What year did the Huastec people leave Maya?
2000 BCE is a reasonable date for the Huastec/Maya split.
Was there a war when the Huastec people tried to leave Maya?

Question: were there many casualties?
Self-contained rewrite: Were there many casualties when the Huastec people seperated from Maya?