Regionalism Vs Nationalism

http://content.msn.co.in/msncontribute/story.aspx?PageID=6bbd27a5-d4ae-42dd-9852-b29ad13206fa

Nowadays the Regionalism is growing than the nationalism. Maharastra for example is showing extreme regionalism in the country. It's treating the outsiders a immigrants as if they have come from a different country. Does this mean people in one country cannot live and work in a different city. Success and growth of mumbai as financial capital is due to its cosmopolitan culture and not due to the regional and local people. If parties are promoting regionalism mumbai cannot grow as talented people will move out of the state. Shiva-sena and MNS are promoting regionalism. Government should come up with a law to ban the parties which are trying to divide the country under the regional lines. I do agree the language and cultures need to be protected but not be used to divide the people.