Some recent research suggests that British rule did little for India in economic terms. Britain gained hugely from ruling India, but most of the wealth created was not invested back into the country. For example, from 1860 to about 1920, economic growth in India was very slow - much slower than in Britain or America.
The mistakes that Louis made at the meeting were the following. King Louis was accompanied by soldiers as an act of intimidation to dissuade votes and he seemed unprepared because he did not bring any real proposal to vote on.