Which of the following did not happen during Nixon presidency?

The Watergate scandal, which ultimately led to Nixon's resignation in 1974, did happen during his presidency. The Strategic Arms Limitation Talks (SALT) with the Soviet Union did occur during Nixon's presidency, resulting in the SALT I treaty in 1972. The Apollo 11 moon landing, a significant achievement in space exploration, took place in 1969 during Nixon's first term. Therefore, the assassination of President John F. Kennedy in 1963 did not happen during Nixon's presidency.