Explanation:

• Kuru basically  belonged  to  the Puru-Bharata family.  These  were  the  people   who   originated   from Kurukshetra (Northern India ). They are believed to have shifted to the republic form of government in the fifth of the sixth century BCE.
• Koshala embraced the area occupied by eastern UP and had its capital at Shravasti, which is coterminous with Sahet–Mahet on the borders of Gonda and Bahraich districts of UP.Koshala had an important city called Ayodhya which is associated with the story in the Ramayana.
• Chedi people existed on the southern part of the Yamuna River. The capital of Chedis was Suktimati and the Rigveda gives details of this Mahajanapada. It was ruled by Sisupala and it was this city where the Pandavas (from Mahabharata) chose to spend the thirteenth year of their exile.
• Assaka or Ashmaka, was a region of ancient India around and between the river Godavari. It was one of the shodasa mahajanapadas in the 6th century BCE, mentioned in the Buddhist text Anguttara Nikaya. The capital is variously called Potali, or Podana, which now lies in the Nandura Tehsil of Maharastra