Why isn't India and Sri Lanka RICH considering?

Fact: India used to be the richest country in the world until the British arrived to colonize. The only reason y North America was founded by Christopher Columbus is b/c he wanted a quicker page to India to gain access to trade and money. As soon as the British came to India they stole and sucked out trillions of dollars worth of goods. That's why India was dirt poor when it gained independence. However we are getting richer and recovering.