How Coffee Influenced The Course Of History : The Salt : NPR

Once people figured out how to roast the seeds of the Coffea plant in the 1400s, coffee took over the world. In doing so, it fueled creativity, revolutions, new business ventures, literature, music — and slavery.

http://www.npr.org/blogs/thesalt/2013/04/24/178625554/how-coffee-influenced-the-course-of-history