The ethnic group that is indigenous to northern Africa is the Berber peoples. Here's why:
1. Berber peoples have a long history in North Africa, predating the Arab conquest of the region. They have inhabited areas such as Morocco, Algeria, Tunisia, Libya, and parts of Egypt for centuries.
2. Berbers have their own distinct languages, cultures, and traditions that are separate from Arab cultures. They have preserved their unique identity despite various historical influences.
3. Berber peoples have faced challenges in maintaining their cultural heritage and languages over the years, but efforts are being made to preserve and revitalize their traditions.
In conclusion, the Berber peoples are considered the indigenous ethnic group of northern Africa due to their historical presence and unique cultural identity in the region.