ईसा पूर्व छठी शताब्दी के दौरान उत्तरी भारत में निम्नलिखित में से कौन सा परिवर्तन मुख्य रूप से नहीं हुआ था?

By whom was the world's first republic established at Vaishali during the Mahajanapada period?

Who was the final ruler of the Nanda dynasty, overthrown by Chandragupta Maurya?

In early Buddhist Pali texts, by what designation is the village headman referred to?