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April 29-30, 1975 - Communist forces complete their takeover of South Vietnam, forcing the evacuation from Saigon of civilians from the United States and the unconditional surrender of South Vietnam.
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July 4, 1976 - The Bicentennial of the United States is celebrated throughout the nation. The 200th anniversary included Operation Sail in New York City, as well as a Bicentennial Wagon Train that traversed the nation during the year.
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November 26, 1976 - Microsoft becomes a registered trademark, one year after its name for microcomputer software is first mentioned by Bill Gates to Paul Allen in a letter
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May 25, 1977 - The movie Star Wars opens and becomes the highest grossing film at the time
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July 13, 1977 - The New York City blackout results in massive looting and disorderly conduct during its twenty-five hour duration.
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September 21, 1977 - Fifteen nations, including the United States and the Soviet Union, sign a nuclear-proliferation pact, slowing the spread of nuclear weapons around the world.
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April 18, 1978 - The United States Senate votes to return the Panama Canal back to Panama on December 31, 1999. A treaty for the return had been signed on September 7 of the previous year, pending approval by the U.S. Congress.
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September 17, 1978 - The Camp David Peace Agreement between Israel and Egypt is formulated in twelve days of secret negotiations at the Camp David retreat of the President. President Jimmy Carter witnessed the signing of the agreement between Israeli Prime Minister Menachem Begin and Egyptian President Anwar Sadat at the White House.
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March 28, 1979 - An accident at the Three Mile Island nuclear power plant in Middletown, Pennsylvania occurs when a partial core meltdown is recorded. A tense situation ensued for five days until the reactor was deemed under control. It is the largest accident in U.S. nuclear power history and considered the worst in the world until the Soviet Chernobyl accident seven years later.
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November 4, 1979 - The Iran Hostage Crisis begins when sixty-three Americans are among ninety hostages taken at the American embassy in Tehran by three thousand militant student followers of Ayatollah Khomeini, who demand that the former shah return to Iran to stand trial.