When world leaders received their invitations to the 2023 G20 summit in New Delhi, everyone got a bit of a surprise. It referred to Narendra Modi as the Prime Minister of Bharat, not India. The debate over the naming of India stretches back nearly 80 years, and tells an important story about the country's history. And Modi's new push for a change in the constitution is just the latest in a series of political fights centred on race, religion and unity in India.