Mauryan Empire
Chandragupta Maurya with the help of Chanakya decided to overthrow the Nandas because

Chanakya wanted to restore the ideal of Kshatriya rule
the Nandas were low-born
Chanakya had been humiliated by the Nandas
the Nandas had accumulated a great deal of wealth by extortion and oppression of the people

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Mauryan Empire
How did the Maurya Empire finally end?

The last Mauryan ruler was killed in a battle with the foreign invader from the north-west
The Kanvas of Central India deposed the last Mauryan ruler
The last Mauryan ruler was killed by his General
The last mauryan ruler had no heir and the throne was claimed by one of his powerful ministers

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