Key concept in nutshell-
Several developments in different parts of the subcontinent (India) the long span of 1500 following the end of Harappan Civilization:-
Rigveda was composed along the Indus and its tributaries.Agricultural Settlements emerged in several parts of the subcontinent.New mode of disposal of the dead like making megaliths.By C 600 BCE growth of new cities and kingdoms.600 BCE major turning point in early Indian history.Growth of sixteen Mahajanapadas. Many were ruled by kings.Some known as ganas or sanghas were oligarchiesBetween the 600 BCE and 400 BCE Magadha became the most powerful Mahajanapada.Emergence of Mauryan Empire Chandragupta Maurya (C 321 BCE) founder of the empire extended control upto Afghanistan and Baluchistan.His grandson Ashoka, the most famous ruler conquered Kalinga.Variety of sources to reconstruct the history of the Mauryan Empire archaeological finds especially sculpture, Ashoka’s Inscriptions, Literary sources like Indica account.