A couple of other minor points Guest Al relating to this pearl you cast before us:

"India was the richest country on earth until the time of British invasion in the early 17th Century."

Point 1 - Fairly obvious but anyone who has even a rudimentary knowledge of history could tell you that prior to the arrival of the British, the Portuguese, the French and the Dutch - There was no such country as India, so it could hardly have been the richest could it?? India was used to describe the land mass that made up the sub-continent. The sub-continent itself consisted of a number of independent states, that the various European powers traded with.

Point 2 - When exactly was this British "invasion" of India Guest Al?? And what did the British use to carry out this "invasion"?? Taking into account that there were roughly 350 million people living on the sub-continent of India at the time and that the British Army at the height of Queen Victoria's power consisted of only 120,000 men - their not so numerous fore-fathers must have been real hard bastards Eh?? Maybe you should look up the history of a London trading House called "The Honourable East India Company" Guest Al, established by Royal Charter on 31st December 1600, by Queen Elizabeth I, became defunct in 1858 (After the Indian Mutiny) and formally dissolved in 1873.