Since Narendra Modi first became prime minister of India in 2014, his Hindu nationalist Bharatiya Janata Party (BJP) has dominated Indian politics. Modi has led the BJP to single-party majorities in two successive national elections -- a feat no leader has achieved since 1971 -- and made deep inroads beyond its traditional strongholds in northern and western India. The BJP currently counts nearly six times more members in the directly-elected lower house of Parliament than its chief rival, the once-dominant left-of-center Congress Party.