Why is Africa sometimes called "The Motherland"

Historically we know the land was one. Earthquakes, hurricanes, and other mother nature disasters have all time after time weakened the land, as a consequence the land collapsesand created small and large parts of it.

One of the reasons why Africa is sometimes called "The Motherland" could be related to the fact that the oldest known fossils of a modern human were found in Ethiopia dating 160,000 years ago. Which could indicate that the Homo Sapien Sapien (term used in paleoanthropology to refer to the anatomically modern man or anatomically modern Homo sapiens) first appeared in Africa, specifically, east Africa rift valley between 200,000-160,000 years ago.

Additionally, It is thought that such anatomically modern humans that inhabited Africa dispersed to Europe and Asia in the Middle Pleistocene, approximately 130,000 years ago, in various migratory movements across the Arabian Peninsula.