While rulers fought for control of the Ganga valley, new invaders appeared at India's frontiers; Cyrus, Emperor of Persia, crossed the Hindu Kush mountains into the Indus valley in 530 b.c.
Rulers fought for control of the Ganga valley so they had better trade routes.
mnli hypothesis: Rulers fought for control of the Ganga valley so they had better trade routes. premise: While rulers fought for control of the Ganga valley, new invaders appeared at India's frontiers; Cyrus, Emperor of Persia, crossed the Hindu Kush mountains into the Indus valley in 530 b.c.