While there is a vast amount of archaeological evidence of their culture, including intricate mounds, burial practices, and elaborate trade networks, no written records or decipherable symbols have been found.
This means we cannot definitively say what language they spoke.
Some theories suggest that:
* They spoke a language related to Algonquian or Iroquoian languages, which are spoken by many Native American groups in the Eastern Woodlands. This is based on similarities in cultural practices and artifacts.
* They spoke a language entirely different from any modern language. This possibility is supported by the lack of clear connections to known language families.
Further research and linguistic analysis are needed to shed light on the Hopewell language.