Around 6th century about mahajanpads have been found in Indian.​

In the sixth century BCE, there was a rise in the development of the Mahajanapada or great country. There were sixteen such Mahajanapadas during 600 B.C. to 325 B.C. in Indian Sub-continent.

Explanation:

By the 6th century BCE, there were approximately 22 different Janapadas. Socio-economic developments chiefly due to the use of iron tools in agriculture and military, along with religious and political developments led to the rise of the Mahajanapadas from small kingdoms or Janapadas. The people gained a strong allegiance to the territory or Janapada they belonged to rather than the tribe or the jana. This period is also known as the era of second urbanisation, first being the Harappan civilisation.

During that period, the political centre shifted from the west of the Indo-Gangetic plains to the eastern side of it. This was due to better fertility of the land because of more rainfall and rivers. Also, this region was closer to iron production centres.

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