Because India had never been closed. The word ‘re-opened’ is a correction — it stops the sentence from accidentally repeating a colonial claim, namely that Europeans ‘discovered’ or ‘opened up’ India.
The evidence is in this very chapter, a few pages earlier:
- India traded with the Greeks and the Romans over two millennia ago.
- Indian goods — spices, cotton, ivory, gems, sandalwood, teakwood, wootz steel — were highly sought after in the Mediterranean world.
- Before European ships arrived, India had extensive internal as well as external trading networks, and European travellers from the 16th century onward described her as ‘flourishing’.
- Vasco da Gama did not find an unknown land in 1498; he arrived at a working port, Kappad near Kozhikode, and was well received until his own aggression spoiled it.
So the traffic in goods, people and ideas between India and the world is very old. What changed under colonial rule was not that contact began, but who controlled it and on what terms. Britain came to control the sea trade and even the exchange rates, so the connection that had once run both ways now ran mainly one way.