Final answer:
The Igbo are the indigenous black people of southeastern Nigeria, known for their trading prowess and artistic contributions, dating back to the times of the ancient Nri Kingdom.
Step-by-step explanation:
The indigenous black people of southeastern Nigeria, renowned as traders and for their art, are the Igbo. The Igbo have a rich history that predates colonial times, with their origins believed to be near the confluence of the Niger and Benue Rivers in Nigeria. Moving onto the Awka-Orlu plateau around four to five thousand years ago, the Igbo lived in autonomous villages and formed a diverse population known for their intricate societal systems, such as the influence of the Exe Nri in their religion, and their connection to the ancient Nri Kingdom. Being skilled traders and creators of fine art, the Igbo people notably made an impression in history, including the use of body marks conveyed as a sense of belonging and status, as described in Olaudah Equiano's autobiography.