Four ancient civilizations, the time when the nation came into being and unified:

1, ancient Babylon: born in 3000 BC, unified in 18 BC.

2. Ancient Egypt: It was formed in 3500 BC and unified around 3 100 BC.

3. Ancient China: It came into being in 2070 BC and was unified in 22 1 year BC.

4. Ancient India: It was born in 3000 BC and unified in the 3rd century BC.

Extended data:

Four ancient civilizations:

1, China Xia Dynasty was founded around 2070 BC, and Qin Shihuang unified China in 22 BC1year.

2. Ancient India appeared around 2500 BC, and small slave countries began to appear in the Indus Valley. Later, around 2000 BC, Aryans established slave countries in the Indus River Valley and Ganges River Valley. The earliest unification of ancient India was in the period of Ashoka (3rd century BC). The Mughal Empire was the most powerful, with the widest territory and the highest degree of unification. The most powerful period was 1658. ?

Around 3500 BC, the earliest slave country appeared in Babylon. At the beginning of BC18th century, the kingdom of Babylon rose. Under the leadership of Hammurabi, it became an empire covering the whole two river basins. ?

4. The ancient Egyptian civilization was formed around 4000 BC, and the pre-Egyptian dynasty began around 3 100 BC. menes unified Egypt and established the first dynasty. ?

References:

Baidu Encyclopedia-Four Ancient Civilizations