Why did bollywood start?

"In 1899 the first Indian short film was screened, and Bollywood was born.Just like in Hollywood the films were silent to begin with, and then in the 1930s the films became 'talkies'. Many Indians came to live and work in Britain around fifty years ago, and they brought their culture with them. Now, Bollywood's biggest audience outside India is in Britain."~(http://news.bbc.co.uk/cbbcnews/hi/find_out/guides/2003/bollywood/newsid_2683000/2683809.stm)