Conversation so far:
What is an example of a indigenous group?
Olmec; Toltec; Teotihuacano' Zapotec; Mixtec; Aztec and Maya civilizations.
Who are the Olmec?
A few, such as the Mayan, Olmec, Mixtec, and Nahua peoples, had their own written languages and records.
What other cultural elements they had?
the term usually includes the history of American indigenous cultures until Europeans either conquered or significantly influenced them.

Question: Did their culture change?
Self-contained rewrite: Did the culture of the American indigenous cultures change over time?