1973 Second Battle of Wounded Knee 1973 Roe v. Wade 1976 Personal Computers Herald the Post Industrial Age 1983 The Grenada Conflict 1987 Alan Greenspan Becomes Chairman of the Federal Reserve 1990 The Gulf War Demonstrates American Military Supremacy 1991 The End of the Cold War 1994 Whitewater Leads to the Impeachment of President Clinton 1999 Y2K Ends the American Century .