1970 By larueaa Period: Jan 20, 1969 to Jan 20, 1974 Richard Nixon Jan 1, 1970 U.S. invades Cambodia Period: Jan 1, 1973 to Jan 1, 1974 Nixon resigns over Watergate May 23, 1973 War Powers Act Period: Jan 20, 1974 to Jan 20, 1977 Gerald Ford Jan 1, 1975 South Vietnam surrenders to North Vietnam Jan 1, 1977 George Lucas: Star Wars Period: Jan 20, 1977 to Jan 20, 1981 Jimmy Carter