History--Indus Valley civilisation

Indus Valley civilisation, (3300-1700 BCE) are a group of people who live in northwestern India around the Indus River. The civilisation encompassed modern-day Iran, Afghanistan, India and most of Pakistan. The major cities are Harappa, Mohenjo-Daro, Mehrgarh, Lothal, Amri, Kot-Diji, Surkotada and Novsharo. They have an efficient government, well planned city, a citadel*and a complex drainage system which transported the water to houses and took away the waste from there. Their occupations of the people there are priests who performed religeous rituals, craftsmen who made pottery and tools, farmers who planted crops and reared cattle and traders.They also have a same writing system.

*A place in Mohenjo-Daro that protected people when an enemy attacked the city.