The document traces the development of early human civilizations from the dawn of humankind in Tanzania around 1.9 million years ago to the Roman civilization between 500 BC to 0 AD. Key events mentioned include the emergence of Homo habilis and Homo erectus in Olduvai Gorge in Tanzania between 1.9-0.7 million years ago, the earliest Homo sapiens in Africa around 200,000 years ago, Neanderthals in Europe between 400,000-40,000 years ago, and prehistoric cave paintings created in France around 25,000 BC. Various civilizations such as the Egyptian civilization between 3,000-300 BC, Greek civilization between 700-200 BC, and Roman civilization