The 6th century BC was considered a turning in the ancient Indian history. These things took place at that period.
1. The rise of early nations. Countries known as Mahajanapadas were formed at this time.
2. The rise of cities and towns. This is the second urbanization process that took place in India.
3. Increased use of iron. As more and more iron was used, forests were cleared it led to the expansion of agriculture. The arms made of iron increased the importance of warriors.
4. The development of coin system. The use of coins made of metals helped in the development of trade and commerce.
5. The growth of religions like Buddhism and Jainism.