There are many tribal groups in Africa. You can't even count them, because there are yet to be discovered tribes in Africa and Nigeria alone has over 400 tribes and about 521 languages. so, I don't think there will be an exact number of the tribes in Africa.
Because there are many different cultural groups in Africa, with varied external influences.
the tribes in Africa are innumerable. tribes in Africa refer to groups of people who share a language, a culture and in most parts, are settled in the same area. There are as many tribes as there are languages which in Uganda alone would be way more than 20. So are you referring to the tribes themselves or ethnic groups? like Bantu, Nilotes, ...etc.
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There are numerous religious groups that may speak the same language, as language and religion are not necessarily correlated. The number of different religious groups speaking the same language will vary depending on the specific language and region in question.
The following 6 West African countries have English as their official (or co-official) language:CameroonThe GambiaGhanaLiberiaNigeriaSierra Leone
There isn't one. Africa has many languages, and always has had many languages. The dominant language groups are Arabic based in the North, and Bantu based in the rest of Africa. Swahili is an interesting 'pidgin' Bantu, based on both Arabic and Bantu components. Both Arabic and Bantu were spread by a long process of wars and conquest. Thousands of smaller languages and dialects exist and are to be found scattered across the continent.
Many different ethnic groups live in Africa - it's a huge continent with many countries.
There are many large Isthmus' in Central Africa
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Yes many pioneers traveled in groups for safety.
Swahili