Some of the regional parties have succeeded only in some states. Parties like the Samajwadi Party, Samata Party and Rashtriya Janata Dal have national level political organisation with units in several states. Over the years, the number and strength of these parties have expanded. No single national party is able to secure majority on its own in Lok Sabha. As a result, the national parties are compelled to form alliances with state parties. Since 1996, nearly everyone of the state parties got an opportunity to be a part of one or the other national level coalition government. This has contributed to the strengthening of federalism and democracy in our country.