Why were there invasions of India in the Middle Ages from the northwest?

It is difficult to penetrate India from the northeast because of the Himalayas. There were no strong states on the eastern side. Only different principalities in Myanmar. China did not expand in this direction. From the sea side, no one could attack, there were no strong states within the Indian Ocean with such a fleet. Muslims and Mongols, as well as Tamerlane, attacked from the northwest. It was convenient to make military campaigns there.



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