Who Built step pyramids and buried the Massive Offerings in La Venta?

The Olmec civilization, one of the earliest Mesoamerican cultures, built the step pyramids and buried massive offerings at La Venta. This site, which dates back to around 900-400 BCE, features a large earthen pyramid and various ceremonial offerings, including jade and obsidian items. The Olmecs are often considered the "mother culture" of later civilizations in the region, influencing subsequent societies in art, religion, and architecture.