The Harad in LOTR were considered the equivalent of North African or Near Harad (Arab) and Sub Saharan Africa Far Harad (Black)...
Harad's tribes were divided--at least in the minds of the men of northwestern Middle-earth--into those of Near and Far Harad, although there were many tribes of the Haradrim, often mutually hostile. Those of Near Harad were brown-skinned, with black hair and dark eyes, whereas the people of Far Harad had black skin. Many say they only banded together due to the fact Sauron was slowly regaining power, and were fearful of Sauron if they continued to war against one another. This was mainly due to Sauron seeing the Harad's as his men and did not want a diminished army due to in-fighting. - Harad - Lord of the Rings Wiki