Explanation: During the process of empire building, Nandas exterminated many kshatriya clans and subjugated kshatriya-ruled kingdoms, which had still retained a degree of autonomous authority, thus creating a centralised state.

An inscription known as the Hathigumpha (elephant cave) from Udayagiri near Bhubaneshwar, Odisha, records the aqueduct built by King Nanda three hundred years earlier.

Source: Tamil Nadu NCERT