When–and why–did India and Pakistan become bitter rivals? The Indian subcontinent is home to some 1.5 billion people who share deep cultural, linguistic and historical ties, but for nearly eight decades, the Indian-Pakistan relationship has been marked by tension, violence, and sometimes all-out war. On Ian Explains, Ian Bremmer breaks down the complicated history of the India-Pakistan conflict to understand why tensions are once again rising after a military clash between the two countries in May 2025.