The beginning of the Holocene (post last ice age) is now universally accepted to be around 12000 BP.
Consequently the civilizations of the world naturally and simultaneously started developing near the rivers which initially started flowing due to the melting of glaciers near the Equator e.g. When populations multiplied, these river waters became insufficient.
Thousands of years later, when some of these Himalayan Rivers became non-perennial or started drying up, some of these people started moving towards Central Asia and Europe.
As per ecologists this ecological cycle has been repeating itself and will get repeated after every ice age and during the beginnings of all Holocene cycles.
Four great philosophies and religions have shaped the spiritual life of the Vietnamese people: Confucianism, Taoism, Buddhism and Christianity.
Over the centuries, Confucianism, Taoism and Buddhism have melded with popular Chinese beliefs and ancient Vietnamese animism to form what is known as Tam Giao(or `Triple Religion’).
It is bordered by the South China Sea on the west and south, China to the north, and Laos and Cambodia to the west.Therefore the history of growth of civilization in the world is not 4 to 5 thousand years old but it is more than 10,000 years old.So far history of the world, particularly of Indian subcontinent, is based on linguistic guesswork and religious beliefs/hearsay.These ends are connected by a mountainous spine that runs along the South China Sea.On the west, Vietnam is bordered by Laos and Cambodia, and to the north, lies China.