Why Did The Maurya Build The Mauryan Empire?

The Mauryan empire started out with a strong man, Chandragupta Maurya. Along with his powerful army, consisting of around 700,000 soldiers with about 9,000 elephants, Chandragupta Maurya (and his army) were able to conquer all of the northern Indian kingdoms because he saw them get weaker, unifying most of the Indian subcontinent. This was a major accomplishment, as well for the family because the subcontinent was very diverse and was a very big landmass, over one million square miles of land was covered in the conquering. Maurya started building his empire in roughly, the 320s BCE.