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Waves of migration
The Indus Valley Civilization was a Bronze Age civilization (mature period 2600-1900 BCE) which was centred mostly in the western part of the Indian Subcontinent and which flourished around the Indus river basin. Primarily centered along the Indus and the Punjab region, the civilization extended into the Ghaggar-Hakra River valley and the Ganges-Yamuna Doab, encompassing most of what is now Pakistan, as well as extending into the westernmost states of modern-day India, southeastern Afghanistan and the easternmost part of Balochistan, Iran.
Along with Ancient Egypt and Mesopotamia it was one of three early civilization of the Old World, and of the three the most widespread It flourished in the basins of the Indus River, one of the major rivers of Asia, and the Ghaggar-Hakra River, which once coursed through northwest India and eastern Pakistan.
Hudson River Valley
In fertile river valleys.
Egypt
The Aryans contributed to the Indus River Valley Civilization's downfall.
The first river valley civilization was Mesopotamia, located in Asia. Asia has had the most river valley civilizations.
The Aryans contributed to the Indus River Valley Civilization's downfall.
Waves of migration
Tectonic shifts caused a major river, the Sarasvati/Ghaggar river, to dry up. There were also changes in the monsoon rains which caused floods followed by droughts, so that most of the people left.
Indus
The geographic factor that was most important to the development of the early river valley civilizations would be the river. This is because it gave them fertile soil to grow crops.
A vehicle for solidarity, such as a totem, king or constitution.
The Nile River Valley was a civilization that started at the northern most peak of the Nile River. Their main economy was largely based on farming, the rich soil being provided by the annual flooding of the Nile River.
While the Indus River itself provided water for drinking, agriculture and boats shipping freight, it was the people of the Indus Valley who made use of the river and the land to their benefit.
The most isolated ancient civilization in India is the Sentineslese. They number around 250 and have lived on their island for about 60,000 years.