Question

Why did the Invaders attack India?

Answer 1

The first foreign invasion was of course the Aryans.  Later you had the invasion of Alexander the Great.  The muslim invaders mentioned above were able to integrate themselves over time into Indian culture and like the Aryans became an integral part of Indian society.  India not only has the spices, minerals and textiles mentioned above, but great fertile river valleys. It's agricultural potential and riches were also part of the lure to invaders