How did the Nanda Dynasty end?

The Nanda Dynasty ended when Chandragupta Maurya, supported by his mentor Chanakya, overthrew the last ruler of the Nanda Dynasty, Dhana Nanda.

For further reading check the following articles:

• 16 Mahajanapadas
• Mahajanapadas – Society and Material Life
• Difference Between Janapadas and Mahajanapadas