Answer :

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Along with a number of colonies in North America, the Caribbean formed the heart of England's first overseas empire. The region was also known as the 'West Indies' because when the explorer Christopher Columbus first arrived there in 1492, he believed that he had sailed to the 'Indies', as Asia was then known.

Columbus thought he landed in India

Explanation:

When Columbus first landed in the Americans he had thought he landed in India and they were called the West Indies because it was "India" in the west.