Casma–Sechin culture

The Casma-Sechin culture, located in the valleys of the Casma and Sechin Rivers in Peru, is significant for its monumental architecture dating back to 3600 BCE. This culture developed independently and is characterized by its ceremonial platforms, pyramids, plazas, and fortresses. The Sechin Alto pyramid, built between 1600 and 1400 BCE, was the largest construction in the Americas at its time. The culture thrived through a combination of agriculture and maritime resources, with notable trade in cotton for fishing nets. The influence of the highland Chavin culture in the Early Horizon period brought new architectural styles and agricultural practices. Eventually, conflict led to the decline and abandonment of key sites around 100 BCE.