Kent State University Shooting: 4 Kent State University students were killed and 9 injured on May 4th , 1970 when the Ohio National Guard opened fire on a student-led protest against the Vietnam war.
Watergate Scandal: In June 1972, the Democratic National Committee was broken into, resulting in an investigation against the Nixon administration, exposing his involvement and later resulting in his resignation.
Camp David Accords: Jimmy Carter brought Egyptian President and Israeli Prime Minister to his country retreat where they signed the Camp David Accords stabilizing their fractious relationship.
Three Mile Island Disaster: A nuclear reactor partially melted down although radioactive release was minimal so no adverse effects to people were found.
Iran Hostage Crisis: Diplomatic Standoff between the US and Iran where a group of militarized Iranian College Students broke into the US Embassy in Iran and took hostages.
Iran Contra Affair: Secret facilitation of the sale of arms to the Iranian government by the Reagan administration during an arms embargo.