The Islamic State group, often called ISIS, is not just based in Iraq and Syria. A scholar tracks where the group and its affiliates have spread around the globe.
Iraq beat the Islamic State. Now, its Shia government is jailing and even executing all suspected terrorists – most of them Sunni Muslims. The clampdown may inflame a centuries-old sectarian divide.
Despite the fact that the Islamic State is on the run, the terrorist group still manages to inspire, motivate and maintain the social identity and cohesion of its members. Here's how.