This document discusses four major events that helped shape the US criminal justice system: 1) The Civil Rights Movement, 2) The Vietnam War, 3) Rising crime rates in the 1960s and 1970s, and 4) The 9/11 terrorist attacks. It provides historical context around these events, such as the Civil Rights Act of 1964 and protests against the Vietnam War, and how the government responded through initiatives like President Johnson's War on Crime and the Omnibus Crime Control and Safe Streets Act of 1968. The document also covers legal principles that govern criminal laws and procedures, such as due process, rules of evidence, and limits on criminal laws.