This comprehensive worldwide study catalogs terrorist attacks in 2018, during which the Islamic State continued its decline from a quasi-government commanding territory the size of the United Kingdom to a more traditional terrorist network controlling just 1000 square miles. Yet IS still boasts 30,000 adherents in Syria and Iraq, with many others awaiting plans for attacks in their home nations. Organized by region and country, this volume covers domestic and international incidents around the world, outlining significant trends. The author offers several indicators of what to watch in the coming years. The single-year format allows readers access to the most up-to-date information on terrorism, while geographic focus more easily facilitates regional comparison.