In what millennium and why does the history of the Ancient World come to an end?

The history of mankind is divided into several periods, the first of which is the history of the Ancient World. This period covers a long time of human formation. There is a transition not only to a person of a modern image, but also to cultural development. The works of art created in Antiquity are still appreciated. The era of the Ancient World ends in the middle of the 1st millennium AD. This transition to the Middle Ages was marked by the attack on the Roman Empire by barbarian tribes. Their attacks led to the destruction of cultural values ​​and the destruction of cities. So, the transition to the Middle Ages took place in the 5th century. AD