The majority of terrorist attacks that occur in the United States have been carried out by

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According to a study by the University of Maryland's National Consortium for the Study of Terrorism and Responses to Terrorism, lone wolves were responsible for more than 80% of the terrorist attacks in the United States from 2000 to 2013. This includes individuals who acted alone or in small groups without direct guidance from a larger organization. Former military personnel, international terrorist organizations, and al-Qaeda have all been responsible for terrorist attacks in the United States, but they are not the majority.

The Majority of Terrorist Attacks That Occur in the United