Starbucks and Coca-Cola might be relatively recent inventions, but America's craving for caffeinated beverages dates back at least a millennium, according to a new study published this week in the In the study, researchers from the University of New Mexico and their colleagues found that people living in the southwestern US and northwestern New Mexico drank highly caffeinated beverages made out of holly and cacao between 750 and 1,400 AD, Lead author and distinguished professor of anthropology Patricia Crown explained that one of the drinks was a cacao-based chocolate drink, while the other was what Native Americans used to call "black drink" and was made out of holly.