Ancient DNA from Georgia pottery confirms cacao reached Mississippian civilization 800-900 years ago
Genetic analysis of 11th-12th century pottery at Etowah Indian Mounds reveals cacao consumption in the eastern United States, pushing back understanding of pre-Columbian trade networks.
What happened
Researchers conducted DNA analysis on pottery fragments from the Etowah site near Atlanta, Georgia, dating to the 11th and 12th centuries. Two pottery samples cleared the researchers' threshold for identifying Theobroma cacao, with DNA fragments showing characteristic degradation patterns consistent with ancient material. The genetic lineages most closely resembled Amelonado and Curaray cacao, both originating in the Amazon basin. The pottery came from pits containing animal bones and ceramics interpreted as remains of communal feasting during the construction of Etowah's first platform mound.
Context
Because cacao cannot grow in Georgia's climate, its presence at Etowah demonstrates the existence of extensive pre-Columbian exchange networks capable of moving tropical goods across long distances in North America. This finding parallels an earlier 2009 discovery of cacao consumption at Chaco Canyon in New Mexico (1050-1350 CE) and extends evidence of cacao distribution farther east than previously documented. The research suggests cacao may have traveled from Central America or indirectly through Southwest communities, though genetic markers are insufficient to identify the specific route. The association of cacao with communal feasting indicates it held ceremonial or social significance beyond being merely a luxury item. The discovery prompts reconsideration of earlier chemical residue analyses at other Mississippian sites like Cahokia, which may contain cacao mistaken for the native yaupon holly plant.
What's disputed
The exact route by which cacao reached Georgia remains unclear, with two possible pathways suggested but no direct archaeological evidence currently establishing either. The immediate source of the Etowah cacao cannot be pinpointed due to insufficient surviving genetic markers.