It all started by the Indus river located right by the Himalayan Mts where the Indians built their civilization in 3300– 1300 BCE
They built their buildings out of mud bricks. Over time the cities got taller since they built new houses on top of old ones.
The Indians had a central well where people stood on a brick 'shower tray' and tipped the clean water over themselves from a jar. Public and private baths, sewage was disposed through underground drains built with precisely laid bricks, and a sophisticated water management system with numerous reservoirs was established.
The Great Bath was believed to be used for special religious functions it was believed to purify and renew the well being of the bathers.
The farmers prepared the big fields by using wooden plows. While they also knew how to use the river to their advantage for their crops.
Indus Valley cities lived by trade. Farmers brought food into the cities. City workers made such things as pots, beads and cotton cloth. Traders brought the materials workers needed and took away finished goods to trade in other cities. Exchanging goods was their currency