Who was the first mound builders?

Answer 1

The first mound builders in North America were indigenous cultures that emerged around 3000 BCE, with the Adena culture being one of the earliest known groups. They primarily inhabited the Ohio Valley and are recognized for constructing earthen mounds for various purposes, including burial and ceremonial sites. The Adena culture later influenced other mound-building societies, such as the Hopewell culture, which developed more complex mound structures and trade networks.