Twenty-five years after 9/11, how much has actually changed? 9/11 is one of those rare moments that divides history into a “before” and an “after.” On Ian Explains, Ian Bremmer looks back at the attacks that reshaped US foreign policy, launched the war on terror, and ushered in an era of military intervention, mass surveillance, and profound geopolitical change. From the rise of China and Russia as security threats to social media and artificial intelligence reordering our politics and flow of information, the world today looks very different from the one we knew that September morning.