1973: President Richard Nixon, just re-elected in November 1972, comes under fire for his possible involvement in the Watergate scandal. In the following year, Nixon's impeachment is recommended and he resigns from office.

1998-1999: President Bill Clinton comes under fire for lying under oath and covering up his sexual relationship with a White House intern, Monica Lewinsky. The Senate does not find him guilty of the "high crimes and misdemeanors" necessary to remove him from office.

1973: The social movements for civil rights and against the war in Vietnam engender other related movements. One is the feminist movement. Another is the environmental movement. For the first time in U.S. history, Congress debates laws intended to protect natural resources such as clean air and water from corporate and individual polluters. President Nixon supports some of these ideas.

2000: Both Democratic candidates for President, Al Gore and Bill Bradley...