section_path: History/Early history
section_name: Early history
paragraph_text: Early history
  
  The geographical area now known as the Democratic Republic of the Congo was populated as early as 90,000 years ago, as shown by the 1988 discovery of the Semliki harpoon at Katanda, one of the oldest barbed harpoons ever found, believed to have been used to catch giant river catfish.
  
  Bantu peoples reached Central Africa at some point during the first millennium BC, then gradually started to expand southward. Their propagation was accelerated by the adoption of pastoralism and of Iron Age techniques. The people living in the south and southwest were foraging groups, whose technology involved only minimal use of metal technologies. The development of metal tools during this time period revolutionized agriculture. This led to the displacement of the hunter-gatherer groups in the east and southeast. The final wave of the Bantu expansion was complete by the 10th century, followed by the establishment of the Bantu kingdoms, whose rising populations soon made possible intricate local, regional, and foreign commercial networks that traded mostly in slaves, salt, iron, and copper.