2020 marks the 25th anniversary of this devastating attack: On April 19, 1995, a U.S. Army veteran named Timothy McVeigh detonated a truck bomb outside the Alfred P. Murrah Federal Building in Oklahoma City, killing 168 people and injuring hundreds more. Join us on a four-part series examining the event. In this first episode, we look at the historic underpinnings of domestic terrorism in the U.S., and chronicle the events that triggered McVeigh’s revenge against the government.