The 1960s saw the rise of regionalist politics in Bombay, with the formation of the Shiv Sena on 19 June 1966, under the leadership of Balasaheb Thackeray out of a feeling of resentment about the relative marginalisation of the native Marathi people in Bombay.[38] Shiv Sena switched from 'Marathi Cause' to larger 'Hindutva Cause' in 1985 and joined hands with Bhartiya Janata Party (BJP) in the same year.[39] The Congress had dominated the politics of Bombay from independence until the early 1980s, when the Shiv Sena won the 1985 Bombay Municipal Corporation elections.[40]