Ah ha! Found it!
"Okra is found in it's wild state on the alluvial banks of the Nile and the Egyptians were the first to cultivate it in the basin of the Nile (12'th century BC). It was propagated then through North Africa to the Mediterranean, the Balkans, and India. It arrived then in the Americas at Brazil (1658), Dutch Guinea and at New Orleans before extending in the United States and going up to Philadelphia in 1781."
In the 1800's slaves from Africa used ground okra as a part of their diet, and this apparently led to the use of ground okra seeds as a coffee substitute by other southerners during the American Civil War blockades of the 1860's. Even today, ground okra is used in West Africa to make a "...local soup made from dried and ground okra, baobab leaves or rosselle. Fish may be added into it .."
