Where is the first language thought to have developed based on the theory of scientific monogenesis

The first language is tought to have developed in Southern Africa.

Explanation:

The monogenism is a theory that support the idea that all humans, no matter the race, come from a common descendant, or that we all have the same origins.  If you expend this theory to language, all humans would have spoken a single language at one time.  

It would also mean that all language spoken now are derived from a single language, which would have evolved in the about 5000 different languages spoken now.

It is hard to pinpoint a location for the creation of a language as historian need to rely on written documents. The first written language was Egyptian or Sumerian, but the first examples of those written language go back only to 3200 BC or there about.

However, it is believed that it appeared in Southern Africa between 200,000 and 60,000 years ago.  That is at that time that human became physically able of speech.  Prior to that, the human body could not produce the complex sounds needed for a spoken language.

Starting about 200,000 ago, this language would have travel across the Earth as the original people from Africa moved to different regions.

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. austria-hungary began seizing british colonies in africa.