June 13, 1971The Pentagon Papers -- classified Defense Department documents about the Vietnam War -- are published by The New York Times.Sept. 3, 1971A group of White House aides burglarizes a psychiatrist's office to find files on Daniel Ellsberg, the former defense analyst who leaked the Pentagon Papers.June 17, 1972Five men, one claiming to be a former CIA operative, are arrested at 2:30 a.m. trying to bug the offices of the Democratic National Committee at the Watergate hotel and office complex.June 19, 1972One of the Watergate burglars is a GOP security aide. Former attorney general John Mitchell, head of the Nixon re-election campaign, denies any link to the operation.Aug. 1, 1972A cashier's check for $25,000, apparently intended for the Nixon campaign, showed up in the bank account of a Watergate burglar.Sept. 29, 1972It is revealed that John Mitchell, while serving as attorney general, managed a secret Republican fund used to finance spying on Democrats.Oct. 10, 1972FBI agents conclude that the Watergate burglarly was part of a much larger conspiracy of political spying and sabotage conducted on behalf of the Nixon re-election campaign.Nov. 7, 1972President Richard M. Nixon defeats the Democratic candidate, Sen. George McGovern of South Dakota, in a landslide.Jan. 30, 1973Former Nixon aides G. Gordon Liddy and James W. McCord Jr. are convicted of conspiracy, burglary and wiretapping in the Watergate scandal. Five other men also plead guilty.April 30, 1973White House aides H.R. Haldeman and John Ehrlichman, and Attorney General Richard Kleindienst resign. White House counsel John Dean is fired.May 18, 1973The nationally televised Senate Watergate Committee hearings begin.June 13, 1973Watergate prosecutors find a memo to Ehrlichman describing plans to burglarize the office of Ellsberg's psychiatrist.June 3, 1973Dean admits that he discussed the Watergate cover-up with Nixon at least 35 times.July 13, 1973Former presidential appointments secretary Alexander Butterfield reveals before Congress that since 1971 Nixon had recorded all conversations and telephone calls in his offices.July 23, 1973Nixon refuses to turn over the presidential tape recordings to the Senate Watergate Committee or the special prosecutor.Oct. 20, 1973Nixon fires Justice Department special prosecutor Archibald Cox and abolishes the office of the special prosecutor.Nov. 17, 1973Nixon declares, "I'm not a crook," maintaining his innocence in the Watergate case.Dec. 7, 1973The White House can't explain an 18 -minute gap in one of the subpoenaed tapes.April 30, 1974The White House releases edited transcripts of the Nixon tapes to the House Judiciary Committee. The committee demands that the actual tapes be turned over.July 24, 1974Rejecting the notion of executive privilege, the Supreme Court orders Nixon to turn over tape recordings of 64 White House conversations.July 27, 1974The House Judiciary Committee passes the first of three articles of impeachment, charging obstruction of justice.Aug. 8, 1974Nixon becomes the first U.S. president to resign. Vice President Gerald R. Ford assumes the presidency. Ford later pardons Nixon of all charges related to the Watergate burglary.