Conversation so far:
What is an indigenous group?
The indigenous peoples of the Americas are the pre-Columbian peoples of North, Central and South America and their descendants.
Who are The Olmecs?
The territory of modern-day Mexico was home to numerous indigenous civilizations prior to the arrival of the Spanish conquistadores: The Olmecs.

Question: What other cultural elements they had?
Self-contained rewrite: What other cultural elements did The Olmecs have?