Yes , Ethiopia Traded slaves .

Historically, Ethiopians had exploited slaves as domestics or as farm laborers, frequently under gang conditions, or to proclaim wealth and status. As long as Ethiopia was autarkic, the available agricultural surplus could support the mass of slaves. The intrusion of the world economy in the late nineteenth century and the subsequent growth of cash crops in southern Ethiopia transformed the situation. During the 1920s, Ethiopian agriculture, especially in coffee, became increasingly profitable,
rendering the exploitation of slaves uneconomic in terms of opportunity costs. Moreover, feudal lords suddenly became interested in transforming rights over gabbars into rights over land. They entered into economic alliances with each other and the Asian traders who mediated capitalism in Ethiopia. In short, the feudal nobility transformed itself into an oligarchy more interested in profit than pageantry.

Lucy and the Ethiopian History

Four million years ago, near Hadar in the most easterly part of Ethiopia's Welo Province, there was a lake in a verdant setting. Its subsequent desiccation safeguarded a treasure for future paleoanthropologists: in 1974, an old shore or marsh yielded up the fossilized remains of "Lucy Australopithecus afarensis ," a relatively young hominid woman. Her almost complete skeleton reveals an ape-faced species that had just begun its evolution toward intelligence. Her small brain,
one-third the size of that of a modern human, directed a compact and rugged body, little more than a meter tall and weighing about thirty kilos, set on pelvic and leg bones dense enough to support erect and sustained walking, if not speedy locomotion. She and her larger male counterpart scavenged meat from carnivores, caught smaller animals, and collected fruit, vegetables, roots, and tubers. Though they used sticks and stones, they did not hunt; they spent most of their lives gathering and collecting near water and sheltering trees. Even with its obvious limitations, Australopithecus afarensis survived for at least two million years before giving way to its closely related cousin Australopithecus africanus ,present about three million years ago in Ethiopia's Omo region.
The Ethiopians call her Dinkenesh , or "she is wonderful."