The Purge movie timeline is almost as complicated as the horrific morals at its center. Based around the premise that all crime is legal for one night of the year across America, The Purge timeline is intriguing, as a US where annual purging is legal feels completely alien yet, at the same time, worryingly not far enough from reality. Writer/director/producer James DeMonaco has expanded the world of The Purge significantly since the first movie arrived in 2013, and several key events in the timeline explain how the New Founding Fathers came to power and started the brutal practice.