Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Nanda dynasty is said to be established by an illegitimate son of the king Mahanandin of the previous Shishunaga dynasty. Mahapadma Nanda died at the age of 88 and, therefore, he ruled the bulk of the period of this dynasty, which lasted 100 years. The Nandas were followed by the Maurya dynasty.
The first Nanda, the Mahapadma Nanda has been described as the destroyer of all the Kshatriyas. He defeated Ikshvakus, Panchalas, Kasis, Harhayas, Kalingas, Asmakas, Kurus, Maithilas, Surasenas, Vitihotras, etc. He expanded his territory till south of Deccan. The last of the Nandas was Dhana Nanda. Plutarch tells that Chandragupta Maurya had stated that he was able to overthrow Dhana Nanda as he was hated and despised by his subjects on account of the wickedness of his disposition.
The Nandas who usurped the throne of the Shishunaga dynasty were of low origin. Some sources state that the founder, Mahapadma, was the son of a Shudra mother, others that he was born of a union of a barber with a courtesan. Nandas were the first of a number of dynasties of northern India who were of non-kshatriya origin.
The Nandas are sometimes described as the first empire builders of India. They inherited the large kingdom of Magadha and wished to extend it to yet more distant frontiers. To this purpose they built up a vast army consisting of 20,000 cavalry, 200,000 infantry, 2,000 chariots and 3,000 elephants. But the Nandas never had the opportunity to use this army against the Greeks, who invaded India at the time Dhana Nanda, since Alexander's campaign terminated in the Punjab.(Some scholars are of the opinion that Alexander confined his conquest to the plains of Punjab for fear of the Mighty Nandas).
The Nandas made the methodical collection of taxes by regularly appointed officials a part of their administrative system. The treasury was continually replenished, the wealth of the Nandas being well-known. The Nandas also built canals and carried out irrigation projects. The possibility of an imperial structure based on an essentially agrarian economy began to germinate in the Indian mind. But further development of the Nandas was cut short by Chandragupta Maurya and his mentor Chanakya. Chanakya dethroned Dhana Nanda in a battle of wits and replaced him with Chandragupta Maurya, a young adventurer. Dhana Nanda was murdered which finally signaled the advent of the Mauryan era in 321 B.C.
