North America

U.S. Conducts Largest Underground Nuclear Test Cannikin

Amid Cold War tensions and the development of anti-ballistic missile systems, the United States Atomic Energy Commission prepared a major test on remote Amchitka Island in the Aleutians. The Cannikin shot, part of Operation Grommet, aimed to validate the W71 warhead for the Spartan missile. On November 6, the device with a yield of nearly 5 megatons was detonated at a depth of about 5,800 feet. The explosion registered 7.0 on the Richter scale, caused visible ground movement, and formed a large crater. Environmental concerns had sparked protests, including early actions by what became Greenpeace.

U.S. Senate Approves Equal Rights Amendment for State Ratification

The proposed Equal Rights Amendment, originally drafted in 1923 by suffragists Alice Paul and Crystal Eastman, sought explicit constitutional protection against sex-based discrimination. After decades of advocacy and renewed momentum from the second-wave women’s movement, Representative Martha Griffiths reintroduced the measure. The House passed it in 1971, and on March 22, 1972, the Senate approved an identical version by an 84–8 vote, sending the amendment to the states with a seven-year ratification deadline later extended to 1982. President Richard Nixon endorsed the effort. Although 35 states ultimately ratified, the amendment fell three states short of the required 38, leaving its status contested in subsequent legal and political debates.

Watergate Burglars Arrested, Sparking Scandal

On the night of June 16–17, 1972, five men were apprehended inside the Democratic National Committee headquarters at the Watergate complex in Washington, D.C., while attempting to install wiretaps and photograph documents. The intruders carried sophisticated equipment and had connections to the Committee to Re-elect the President. Initial coverage treated the incident as a routine burglary, but investigations soon revealed ties to the Nixon White House and a broader pattern of political espionage. The arrests set in motion congressional hearings, special prosecutions, and revelations of a cover-up that ultimately forced President Richard Nixon's resignation in 1974.

Title IX Prohibits Sex Discrimination in Education

In the early 1970s, advocates highlighted systemic barriers facing women and girls in American schools, including limited athletic opportunities, biased admissions, and unequal resources. Sponsored by Senator Birch Bayh and others, the provision was added to broader education legislation. On June 23, 1972, President Richard Nixon signed the Education Amendments of 1972 into law, with Title IX stating that no person shall be excluded from participation in, denied benefits of, or subjected to discrimination under any education program receiving federal financial assistance on the basis of sex. The statute applied to nearly all schools and required equitable treatment in academics, athletics, and other activities. Implementation began immediately, though regulations took several years to finalize.

Exploration 20th Century North America

Apollo 17 Launches Final Crewed Moon Mission

By late 1972, the Apollo program had already achieved several lunar landings, but budget constraints and shifting priorities signaled the end of crewed Moon missions. Apollo 17 lifted off from Kennedy Space Center at 12:33 a.m. EST on December 7, 1972, after a brief delay caused by a launch sequencer issue. Commanded by Eugene Cernan with Harrison Schmitt and Ronald Evans, the mission included the only night launch in the program and carried a Lunar Roving Vehicle for extended exploration. The crew landed in the Taurus-Littrow valley, conducted three moonwalks, collected samples including orange soil of volcanic origin, and captured the iconic Blue Marble photograph of Earth. The spacecraft returned safely on December 19, closing the Apollo era.

Event Detail Daily Earth View

U.S. Supreme Court Issues Roe v. Wade Decision

In the decades leading up to 1973, most U.S. states maintained strict criminal laws restricting abortion except in narrow circumstances such as saving the mother's life. The case originated when Norma McCorvey, under the pseudonym Jane Roe, challenged a Texas statute banning most abortions, arguing it violated constitutional privacy rights. On January 22, 1973, the Supreme Court ruled 7-2 that the Texas law was unconstitutional, recognizing a woman's right to choose an abortion before fetal viability under the Due Process Clause of the Fourteenth Amendment. Justice Harry Blackmun authored the majority opinion establishing a trimester framework for state regulations. The decision immediately invalidated similar laws nationwide and transformed reproductive healthcare access.

Military 20th Century North America

Last U.S. Combat Troops Leave South Vietnam

The United States had been deeply involved in the Vietnam War since the early 1960s, with troop levels peaking above half a million. After years of stalemate and growing domestic opposition, negotiations produced the Paris Peace Accords in January 1973, calling for a ceasefire and the withdrawal of American forces. Implementation proceeded over the following months as U.S. units stood down and prisoners of war were exchanged. On March 29, 1973, the final American combat troops departed South Vietnam, ending direct U.S. military participation after more than eight years of major combat involvement. A small Defense Attaché Office remained, but the era of large-scale American ground forces in the conflict concluded.

Event Detail US Military Atlas

Event Detail US Military Atlas

Billie Jean King Defeats Bobby Riggs in Battle of the Sexes

Tennis champion Bobby Riggs, a self-described male chauvinist, had earlier beaten Margaret Court and publicly claimed women could not compete with men under pressure. Billie Jean King, a leading women's player and advocate for equality, accepted his challenge after initial reluctance. On September 20, 1973, before more than 30,000 spectators at the Houston Astrodome and an estimated 90 million television viewers worldwide, King defeated the 55-year-old Riggs in straight sets, 6-4, 6-3, 6-3. The theatrical match featured dramatic entrances and intense media coverage.

Nixon Signs U.S. Endangered Species Act into Law

By the early 1970s, habitat loss and overhunting had driven numerous American species toward extinction, prompting bipartisan concern. President Richard Nixon had called for stronger protections in 1972. On December 28, 1973, he signed the Endangered Species Act, which authorized federal agencies to identify and protect threatened and endangered plants and animals. The law prohibited actions that harmed listed species or their critical habitats and required recovery plans. It immediately listed several species and established a framework still in use today.

Exploration 20th Century North America

Mariner 10 Makes First Flyby of Mercury

NASA's Mariner 10 spacecraft, launched in November 1973, used a gravity assist from Venus to reach the innermost planet. Mercury had never been visited by a probe, and scientists sought close-up data on its surface, magnetic field, and environment. On March 29, 1974, the spacecraft passed within 437 miles of Mercury, returning the first detailed images and measurements of the planet's cratered terrain and confirming a weak magnetic field. The encounter also revealed a thin helium-rich exosphere. Mariner 10 would make two additional flybys, providing the bulk of knowledge about Mercury until the MESSENGER mission decades later.

Event Detail Daily Earth View

Culture 20th Century North America

Hank Aaron Breaks Babe Ruth's Home Run Record

In the mid-twentieth century, Major League Baseball stood as a national pastime grappling with its history of racial segregation while celebrating individual excellence. Hank Aaron, an African American outfielder for the Atlanta Braves who had endured death threats and pressure during his pursuit of the record, entered the 1974 season one home run shy of Babe Ruth's 714. On April 8, 1974, before a sellout crowd at Atlanta-Fulton County Stadium, Aaron connected on a fourth-inning pitch from Los Angeles Dodgers pitcher Al Downing, sending his 715th career home run over the left-field fence. The feat surpassed Ruth's long-standing mark and was celebrated amid national attention, with Aaron finishing his career with 755 homers.

House Committee Votes to Impeach Nixon

The Watergate scandal unfolded after a 1972 break-in at Democratic National Committee headquarters, with evidence emerging of a cover-up involving President Richard Nixon's administration, including tape recordings of Oval Office conversations. The House Judiciary Committee conducted months of hearings examining articles of impeachment for obstruction of justice, abuse of power, and contempt of Congress. On July 27, 1974, the committee voted 27 to 11 in favor of the first article, charging Nixon with obstruction of justice related to the cover-up. Bipartisan support signaled eroding confidence in the president amid ongoing investigations and public pressure.

Culture 20th Century North America

Philippe Petit Walks Between Twin Towers

French high-wire artist Philippe Petit had long planned an unauthorized performance to connect the newly completed World Trade Center towers in New York City. On August 7, 1974, he stretched a steel cable between the roofs of the 110-story buildings, 1,350 feet above the ground. Petit walked back and forth eight times over 45 minutes, performing ballet-like movements and even lying on the wire. Police arrested him upon completion, but charges were dropped after he agreed to perform for children. The feat captivated the public and was later chronicled in the documentary Man on Wire.

Event Detail

Politics 20th Century North America

President Nixon Announces Resignation Amid Watergate

The Watergate scandal, involving a break-in at Democratic headquarters and subsequent cover-up, had engulfed the Nixon administration by mid-1974 with mounting evidence of obstruction of justice. Facing certain impeachment by the House and conviction in the Senate after the release of incriminating tapes, President Richard Nixon addressed the nation on August 8, 1974. He stated he would resign effective at noon the following day, becoming the first U.S. president to do so. Vice President Gerald Ford was sworn in as the 38th president on August 9. The resignation followed months of congressional hearings, special prosecutor investigations, and eroding public support.

Politics 20th Century North America

Nixon Resigns Amid Watergate Scandal

The Watergate scandal, involving a break-in at Democratic National Committee headquarters and subsequent cover-up, had eroded public trust in the Nixon administration since 1972. Congressional investigations, Supreme Court rulings on tapes, and impeachment proceedings in the House intensified pressure on President Richard Nixon. On August 9, 1974, Nixon became the first U.S. president to resign from office, delivering a farewell address from the White House and transferring power to Vice President Gerald Ford. The resignation avoided a likely Senate conviction on articles of impeachment related to obstruction of justice and abuse of power. Ford's subsequent pardon of Nixon sparked further controversy over accountability.

President Ford Pardons Richard Nixon

In the wake of the Watergate scandal that forced Richard Nixon's resignation on August 9, 1974, newly sworn-in President Gerald Ford confronted deep national divisions over accountability for presidential misconduct. Ford, who had not been elected to either the presidency or vice presidency, weighed the need for closure against ongoing legal proceedings. On September 8, 1974, he issued a full, unconditional pardon to Nixon for any federal crimes committed during his presidency. The decision, announced from the Oval Office, aimed to end the national ordeal but immediately sparked widespread controversy and accusations of a deal. Nixon accepted the pardon without admitting guilt.

1975

Bill Gates and Paul Allen Found Microsoft

In the mid-1970s, the personal computer revolution was beginning with hobbyist kits like the Altair 8800. Childhood friends Bill Gates and Paul Allen, inspired by a magazine cover, developed a BASIC interpreter for the machine while in Albuquerque. On April 4, 1975, they officially established Microsoft (initially Micro-Soft) to sell software for microcomputers. Gates served as CEO from the start, focusing on licensing software rather than hardware. The company quickly secured deals and relocated to Washington state, laying the foundation for dominant operating systems.

Disaster 20th Century North America

1975

SS Edmund Fitzgerald Sinks on Lake Superior

In the autumn of 1975, the Great Lakes faced severe storms that tested even the sturdiest ore carriers. The SS Edmund Fitzgerald, a 729-foot freighter loaded with taconite pellets, departed Superior, Wisconsin, bound for Detroit. On November 10, amid hurricane-force winds and massive waves on Lake Superior, the ship encountered catastrophic conditions near the Canadian shore. It disappeared from radar without issuing a distress call, sinking rapidly and claiming all 29 crew members. The wreckage was later located in 530 feet of water, with investigations pointing to structural failure or flooding as likely causes.

Event Detail Disaster Kit Pro

1978

Harvey Milk and George Moscone Assassinated in San Francisco

In the 1970s, San Francisco emerged as a center of LGBTQ+ activism amid broader civil rights movements, with Harvey Milk elected in 1977 as one of the first openly gay public officials in the United States. Tensions rose between progressive supervisors like Milk and more conservative colleagues, including former supervisor Dan White. On November 27, 1978, White entered City Hall through a basement window and fatally shot Mayor George Moscone in his office before killing Milk in an adjacent room. The assassinations shocked the city, sparking massive protests and highlighting deep divisions over gay rights, urban politics, and gun access in local government.

Disaster 20th Century North America

1979

Three Mile Island Nuclear Accident Begins

At the Three Mile Island Nuclear Generating Station in Pennsylvania, a series of equipment failures and operator errors unfolded in the early morning hours. A stuck relief valve allowed coolant to escape from the Unit 2 reactor, leading to overheating and partial core meltdown. Plant operators initially misread instruments and took actions that worsened the situation. By midday on March 28, 1979, radioactive gases had been released, prompting public concern and evacuations. The incident was contained without immediate fatalities, but it exposed critical flaws in reactor design, training, and emergency procedures. Investigations followed rapidly.

Event Detail Disaster Kit Pro

1980

CNN Begins 24-Hour News Broadcasting

In the late twentieth century, cable television expanded rapidly in the United States, creating opportunities for specialized programming beyond the traditional broadcast networks. Media entrepreneur Ted Turner, already successful with the TBS superstation, envisioned a channel dedicated exclusively to news. On June 1, 1980, Cable News Network (CNN) signed on from its Atlanta headquarters with anchors David Walker and Lois Hart delivering the first broadcast. The debut featured live coverage and a commitment to continuous reporting, initially reaching a modest audience of about 1.7 million households. Despite early financial challenges, the network pioneered the 24-hour news cycle.

Culture 20th Century North America

1980

John Lennon Fatally Shot Outside His New York Home

John Lennon, former Beatle and influential solo artist known for songs promoting peace and social change, had returned to recording after a five-year hiatus. On the evening of December 8, 1980, he and Yoko Ono arrived at their Dakota apartment building in Manhattan. Mark David Chapman, a troubled fan who had earlier obtained Lennon's autograph, waited outside and shot him four times as he entered the building. Lennon was rushed to a nearby hospital but was pronounced dead on arrival. The assassination triggered an immediate global outpouring of grief and tributes from fans and fellow musicians.

Event Detail Assassination Attempts

1981

Politics 20th Century North America

John Hinckley Jr. Shoots President Ronald Reagan

Just over two months into his presidency, Ronald Reagan had delivered a speech at the Washington Hilton Hotel on March 30, 1981. As he exited toward his limousine, John W. Hinckley Jr. fired six shots from a .22 revolver, wounding Reagan in the chest, Press Secretary James Brady in the head, a Secret Service agent, and a police officer. Hinckley, motivated by a desire for notoriety and obsession with actress Jodie Foster, was quickly subdued. Reagan underwent emergency surgery and recovered fully. The incident led to enhanced presidential security protocols.

Event Detail Assassination Attempts

1981