Why was india the “middle-man” in ancient times?

India had the passage to Eastern Asia.

Explanation:

India often had the trade route to Asia, so instead of allowing the european traders to pass through their land, they´d just go to China and the other eastern asiatic empires, buy whatever the europeans wnated and re-sell it to the European traders that arrived at India. That´s why historically India in ancient times was the middle man.

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