What was the key internal weakness of the roman empire?

The key internal weakness in the Roman Empire was the lack of political unity. This resulted in the authority of the emperors being challenged every now and then. As a result, there was instability due to usurpers and civil wars.

what are the answers

c. archbishop desmond tutu promoted the acknowledgement of the rights of black africans and expose human rights abuses.

d. leader haile selassie modernized african society through the institution of progressive social, economic, and educational reforms.