Scientists make different assumptions.
At various times on our planet existed quite a large number of civilizations. Some were stronger, others were unable to hold out long. The cause of death of civilizations can be different: disease, war, climate change, natural disasters. You can learn about some civilizations and cultures, whose disappearance raises many questions.
Clovis. 11 500 BC, North America. The representatives of this civilization came from Siberia to Alaska across the Bering Strait by the end of the last ice age. It is possible that they were the first civilizations on the territory of the area. However, Clovis lasted long. The reason for their disappearance remained a mystery.
Tripoli culture, 5500-2750 BC, Ukraine and Romania. Representatives of Tripolye culture is famous for its ceramics. Scientists agree that Trypillians were very well developed. However, their habit to destroy your village when you move to a new place deprived of scientists of many archaeological discoveries.
The Mayan civilization, 2600 BC – 1520 BC, Central America. Its greatest monuments, cities and roads were absorbed by the jungles of Central America, and the population vanished, dissolving into others ‘ tribes.
The Mycenaean civilization, 1600-1100 BC Mycenaean warriors were well-known far beyond the Mediterranean sea. They managed to capture almost all of Greece. The reason for the disappearance remained a mystery. Scientists are considering earthquakes, barbarian invasions or internal strife.