India, July 12 -- India's expanding diaspora is strengthening global influence, investment, innovation, and national confidence worldwide.

"Indians blend into the culture of any country they move to just like sugar dissolves in milk. When one dream is fulfilled, another is born. Besides being a nation of 1.4 billion people driven by aspirations, we are also the world's fastest-growing major economy."

Prime Minister Narendra Modi made this observation in a warm and engaging address to a massive gathering of the Indian community at Melbourne's Marvel Stadium during his visit to Australia. His words carried a deeper message.

Today, the issue is discussed both with admiration and criticism: Are increasing numbers of Indians leaving the cou...