Explain how the use of iron led to the spread of civilisation.

The people in the Later Vedic Age began using implements and tools made of iron. These iron tools helped them to clear forests bringing more land under cultivation. This resulted in surplus production of food grains. The kings used the surplus produce for their military and administrative needs. It was also used by the people in the towns who specialized in various art and crafts. Thus, the use of Iron enabled the people to lead a settled life and to expand further in neighbouring areas.