Major Events of April 1980: Key Historical Moments from the Month

Each month is marked by defining moments that shape the course of history. Whether through political shifts, cultural movements, or world-changing events, these periods leave a lasting impression. Dive into the most important events from April 1980 and discover how they influenced the world both then and now.

Major Events of April 1980: Key Historical Moments from the Month

01 Apr 1980 1980 United States Census Results: The 1980 United States Census, conducted on April 1, 1980, recorded a resident population of 226,542,199, marking an 11.4% increase from the 1970 Census. This was the first census to count Hispanic and Latino Americans as an ethnicity. The most populous state was California with 23,668,562 residents, while the least populous was Alaska with 401,851 residents. The top ten cities by population were New York City, Chicago, Los Angeles, Philadelphia, Houston, Detroit, Dallas, San Diego, Phoenix, and Baltimore. source: census.gov
02 Apr 1980 Crude Oil Windfall Profit Tax Act of 1980 enacted: The Crude Oil Windfall Profit Tax Act of 1980 was enacted on April 2, 1980, imposing an excise tax on domestic crude oil producers to recoup revenues from increased oil prices due to the OPEC oil embargo. The tax was repealed on August 23, 1988, amid low oil prices and concerns over its impact on domestic production and import dependence. source: congress.gov
03 Apr 1980 US Congress restores federal trust relationship with Paiute Indian Tribe of Utah: On April 3, 1980, the U.S. Congress passed the Paiute Indian Tribe of Utah Restoration Act, Public Law 96-227, which restored the federal trust relationship with the Shivwits, Kanosh, Koosharem, and Indian Peaks Bands of the Paiute Indian Tribe. The law also reaffirmed the Cedar Band as part of the tribe. This legislation acknowledged that the Kanosh, Koosharem, and Indian Peaks Bands had lost their lands due to termination policies, while the Cedar Band had never had any. The act proposed developing a plan within two years to secure reservation land for the tribe, not exceeding 15,000 acres. Concurrently, the Bureau of Land Management reinstated the federal trust on 43,576.99 acres. source: congress.gov
04 Apr 1980 Soviet Union conducts nuclear test at Semipalatinsk Test Site in Kazakhstan: On April 4, 1980, the Soviet Union conducted a nuclear test at the Semipalatinsk Test Site in Kazakhstan. This test was part of a series of 24 nuclear tests carried out by the Soviet Union in 1980, involving various test sites including Semipalatinsk. The Semipalatinsk Test Site, located in East Kazakhstan Province, was the primary location for Soviet nuclear testing between 1949 and 1989, hosting a total of 456 nuclear tests. source: en.wikipedia.org
05 Apr 1980 Pink Floyd's "Another Brick in the Wall (Part 2)" tops US charts: On April 5, 1980, "Another Brick in the Wall (Part 2)" by Pink Floyd reached number one on the Billboard Hot 100 chart, marking the band's first and only U.S. number-one single. The song, released on November 23, 1979, was a protest against corporal punishment and rigid schooling, featuring a children's choir. It also topped charts in the UK, Australia, and several other countries. source: thisdayinmusic.com
06 Apr 1980 Post-it Notes introduced by 3M: 3M introduced Post-it Notes nationwide in the United States on April 6, 1980. The product, featuring a unique low-tack adhesive, was initially test-marketed in 1977 under the name "Press 'n Peel" but gained significant popularity after a successful sampling campaign in Boise, Idaho. Post-it Notes quickly became a staple in offices and homes, revolutionizing the way people communicate and organize information. source: post-it.com
07 Apr 1980 US severs diplomatic relations with Iran: On April 7, 1980, the United States officially severed diplomatic relations with Iran. This action was a response to the Iranian hostage crisis, where 52 American diplomats and citizens were held hostage for 444 days. The severance marked a significant deterioration in US-Iran relations, which had been strained since the 1979 Iranian Revolution. source: history.state.gov
08 Apr 1980 Mount St. Helens experiences significant volcanic activity on April 8, 1980: On April 8, 1980, Mount St. Helens erupted in a series of explosions lasting four hours, marking the longest period of activity since the volcano's reawakening. These eruptions were characterized by steam and ash explosions, with ash from the April 9 eruption reaching the Puget Sound region, affecting areas across Washington state. This period of heightened activity continued until April 22, 1980. source: kgw.com
09 Apr 1980 Israeli military incursion into Lebanon on April 9, 1980: On April 9, 1980, hundreds of Israeli troops, accompanied by tanks and armored vehicles, crossed into southern Lebanon, establishing positions approximately three miles inside the border. This operation aimed to intercept Palestinian guerrilla squads suspected of infiltrating Israel. The Israeli forces dug trenches, built bunkers, and set up barbed-wire fences, indicating an intention for an extended presence. The incursion followed a Palestinian commando raid on a northern Israeli kibbutz, which resulted in the deaths of an Israeli soldier and two civilians, including a child. The Israeli military's actions were perceived as a direct response to these attacks, reflecting a lack of confidence in the United Nations peacekeeping force's ability to prevent guerrilla infiltration. The operation was the most significant Israeli incursion into Lebanon in nearly a year. The Israeli Army refused to disclose details of its cross-border operation, stating only that "patrols" were in southern Lebanon "as a precaution against possible terrorist activity." source: washingtonpost.com
10 Apr 1980 Terry Fox Marathon of Hope begins in Canada: The Terry Fox Marathon of Hope commenced on April 10, 1980, when Terry Fox began his cross-Canada run to raise awareness and funds for cancer research. Starting in St. John's, Newfoundland, Fox aimed to run a marathon every day until he reached the west coast. His journey inspired millions and continues to be commemorated through annual events. source: terryfox.org
11 Apr 1980 EEOC publishes sexual harassment guidelines: On April 11, 1980, the Equal Employment Opportunity Commission (EEOC) published guidelines stating that sexual harassment in the workplace constitutes unlawful sex discrimination under Title VII of the Civil Rights Act of 1964. The guidelines defined sexual harassment as unwelcome sexual advances, requests for sexual favors, or other verbal or physical conduct of a sexual nature when submission to such conduct is made either explicitly or implicitly a term or condition of an individual's employment, submission to or rejection of such conduct is used as the basis for employment decisions affecting such individual, or such conduct has the purpose or effect of unreasonably interfering with an individual's work performance or creating an intimidating, hostile, or offensive working environment. source: eeoc.gov
12 Apr 1980 Liberian coup d'état: On April 12, 1980, a military coup in Liberia led by Master Sergeant Samuel Doe resulted in the assassination of President William Tolbert and the establishment of the People's Redemption Council. The coup ended 133 years of Americo-Liberian political dominance and marked a significant shift in the country's governance. source: washingtonpost.com
13 Apr 1980 US and allies boycott 1980 Moscow Olympics: In response to the Soviet invasion of Afghanistan, the United States led a boycott of the 1980 Moscow Olympics. This decision was supported by several allied nations, resulting in a significant absence of athletes from the games, which were held from July 19 to August 3, 1980. The boycott was a political statement against Soviet actions and aimed to pressure the USSR to withdraw from Afghanistan. source: britannica.com
14 Apr 1980 Mariel Boatlift begins, allowing Cuban migration to the U.S.: The Mariel Boatlift commenced on April 14, 1980, when thousands of Cubans began to leave Cuba for the United States. This mass emigration was initiated by Cuban leader Fidel Castro, who announced that anyone wishing to leave Cuba could do so from the port of Mariel. Over the next few months, approximately 125,000 Cubans arrived in Florida, significantly impacting U.S.-Cuba relations and the Cuban-American community. source: britannica.com
15 Apr 1980 Death of philosopher Jean-Paul Sartre: Jean-Paul Sartre, the influential French philosopher, playwright, and novelist, passed away on April 15, 1980. He was a leading figure in existentialism and is best known for works such as 'Being and Nothingness' and 'No Exit'. His death marked the end of an era in philosophical thought and literature. source: britannica.com
16 Apr 1980 Arthur Ashe retires from professional tennis: On April 16, 1980, Arthur Ashe announced his retirement from professional tennis at the age of 36, following a heart attack and subsequent bypass surgery. Despite his retirement, Ashe remained active in the tennis community, serving as captain of the U.S. Davis Cup team from 1981 to 1985. source: si.com
17 Apr 1980 Carter imposes Iran travel ban: On April 17, 1980, President Jimmy Carter issued Executive Order 12211, banning all travel by American citizens to Iran and halting all further imports. This order also forbade financial transactions with Iran by anyone in the United States, as part of escalating sanctions in response to the Iran hostage crisis. source: washingtonpost.com
18 Apr 1980 Zimbabwe gains independence from United Kingdom: On April 18, 1980, Zimbabwe achieved independence from the United Kingdom, ending 90 years of British colonial rule. The country, formerly known as Rhodesia, held its first internationally recognized elections in February 1980, leading to Robert Mugabe becoming the first Prime Minister. The independence ceremony was attended by international dignitaries, including Prince Charles, who represented the British government. source: britannica.com
19 Apr 1980 Johnny Logan wins Eurovision Song Contest 1980: Johnny Logan won the Eurovision Song Contest on April 19, 1980, representing Ireland with the song "What's Another Year." This victory marked Ireland's first win in the competition, and Logan would later go on to win again in 1987. His performances have made him a notable figure in Eurovision history. source: bbc.com
20 Apr 1980 Fidel Castro announces Mariel Boatlift, allowing Cubans to emigrate to U.S.: On April 20, 1980, Cuban President Fidel Castro declared that all Cubans wishing to emigrate to the United States were free to board boats at the port of Mariel, west of Havana. This announcement initiated the Mariel Boatlift, during which approximately 125,000 Cuban refugees arrived in Florida over several months. The exodus was driven by economic hardships and political repression in Cuba. source: britannica.com
21 Apr 1980 Rosie Ruiz disqualified from 1980 Boston Marathon for cheating: Rosie Ruiz initially appeared to win the women's division of the 1980 Boston Marathon with a time of 2:31:56. However, suspicions arose due to her lack of visible exertion and absence from race photographs until the final stretch. Investigations revealed she had joined the race near the finish line, leading to her disqualification and the awarding of the victory to Canadian runner Jacqueline Gareau. source: history.com
22 Apr 1980 Mount St. Helens volcanic activity on April 22, 1980: On April 22, 1980, Mount St. Helens experienced a significant decrease in eruption frequency, with eruptions occurring approximately once per day. This marked a temporary cessation of the heightened volcanic activity that had been ongoing since March 27, 1980. The volcano had been exhibiting increased seismic activity and eruptions, including a magnitude 4.2 earthquake on March 20, 1980, and a phreatic eruption on March 27, 1980, which sent ash 3 km above the vent. By April 22, the eruption frequency had decreased to about one per day, indicating a temporary lull in the volcanic activity. source: usgs.gov
24 Apr 1980 Operation Eagle Claw disaster: On April 24, 1980, the U.S. military launched Operation Eagle Claw, a mission aimed at rescuing 53 American hostages held in Tehran, Iran. The operation faced multiple challenges, including mechanical failures and a severe dust storm, leading to its abortive status. During the withdrawal from the staging area, Desert One, a helicopter collided with a C-130 transport aircraft, resulting in a catastrophic fire that destroyed both aircraft and killed eight U.S. servicemen. source: britannica.com
25 Apr 1980 Dan-Air Flight 1008 crashes into Tenerife mountain, killing all 146 on board: On April 25, 1980, Dan-Air Flight 1008, a Boeing 727-46, crashed into Mount La Esperanza near Tenerife North Airport in Spain, resulting in the deaths of all 146 occupants. The accident occurred when the crew mistakenly executed an unpublished holding pattern in mountainous terrain, leading to a controlled flight into terrain. This remains the deadliest air disaster involving a British-registered aircraft. source: en.wikipedia.org
26 Apr 1980 Iran relocates hostages to thwart U.S. rescue efforts: On April 26, 1980, Iran announced the transfer of American hostages from the U.S. Embassy in Tehran to various locations within Tehran and other Iranian cities. This strategic move aimed to impede any future U.S. rescue operations following the failed attempt on April 24, 1980, which resulted in the deaths of eight American servicemen. The hostages remained in captivity for several more months before being released in January 1981. source: archives.gov
27 Apr 1980 Dominican Republic Embassy siege concludes in Bogotá, Colombia: On April 27, 1980, the M-19 guerrilla group ended a two-month occupation of the Dominican Republic's embassy in Bogotá, Colombia. The guerrillas released the remaining 16 diplomatic hostages, including U.S. Ambassador Diego Asencio, and departed for Cuba, where the hostages were subsequently freed. source: washingtonpost.com
28 Apr 1980 Josh Howard born on April 28, 1980: Josh Howard, a former professional basketball player, was born on April 28, 1980. He is best known for his time with the Dallas Mavericks in the NBA, where he played as a small forward. Howard had a successful college career at Wake Forest University before entering the NBA. source: basketball-reference.com
29 Apr 1980 Washington for Jesus Religious Demonstration: On April 29, 1980, approximately 200,000 Christians gathered on the National Mall in Washington, D.C., for the "Washington for Jesus" rally. Organized by Rev. John Gimenez and other religious leaders, the event aimed to promote Christian values in the political sphere. Participants engaged in prayers, singing, and sermons, addressing issues such as abortion, divorce, pornography, and homosexuality. The gathering was one of the largest religious demonstrations in the U.S. at that time. source: washingtonpost.com
30 Apr 1980 Queen Juliana of the Netherlands abdicates the throne: On April 30, 1980, Queen Juliana of the Netherlands abdicated after 32 years of reign. Her decision was influenced by her declining health and the desire to pass the responsibilities to her daughter, Princess Beatrix, who subsequently became queen. This event marked a significant moment in Dutch monarchy history. source: britannica.com