Daily History AI

Year

1975

9 sourced events from this year.

Events

1975 Timeline

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1975

Law20th CenturyGlobal

Biological Weapons Convention Enters into Force

During the Cold War, concerns over biological weapons as potential tools of mass destruction grew among nations, building on earlier prohibitions like the 1925 Geneva Protocol. Negotiations in the United Nations disarmament forum produced the Biological Weapons Convention, which banned the development, production, stockpiling, and acquisition of biological and toxin weapons. The treaty opened for signature in 1972 in London, Moscow, and Washington. It entered into force on March 26, 1975, after ratification by 22 states, including the depositary governments of the Soviet Union, United Kingdom, and United States. This marked the first multilateral treaty to prohibit an entire category of weapons of mass destruction.

Event Detail
1975

Technology20th CenturyNorth America

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.

Event DetailAmerica 250 Atlas
1975

Military20th CenturySoutheast Asia

Khmer Rouge Captures Phnom Penh

Cambodia's civil war intensified after the 1970 coup against Prince Sihanouk and U.S. bombing campaigns that destabilized the countryside. Khmer Rouge forces, led by Pol Pot and allied with North Vietnam and China, steadily advanced against the Lon Nol government. On April 17, 1975, the capital Phnom Penh fell after a prolonged siege, prompting the evacuation of the city and the start of the Cambodian Genocide. Government forces surrendered, ending the war and installing a radical communist regime that would kill nearly two million people through execution, starvation, and forced labor.

Event DetailUS Military Atlas
1975

Military20th CenturySoutheast Asia

Operation Frequent Wind Evacuates Saigon

With North Vietnamese forces closing in on the South Vietnamese capital in late April 1975, U.S. Ambassador Graham Martin ordered the final helicopter evacuation of American personnel and at-risk Vietnamese allies. On April 29, after shelling damaged runways at Tan Son Nhut, Armed Forces Radio played “White Christmas” as the coded signal to begin Operation Frequent Wind. Marines secured landing zones at the U.S. embassy and DAO compound while CH-53 and CH-46 helicopters ferried evacuees to Seventh Fleet ships offshore in the largest such operation in history. Over the next day, more than 7,000 people, including thousands of Vietnamese, were lifted out before the city fell.

Event DetailUS Military Atlas
1975

Military20th CenturySoutheast Asia

North Vietnamese Forces Capture Saigon

After the 1973 Paris Peace Accords and U.S. withdrawal, South Vietnam faced increasing North Vietnamese offensives with limited American support. North Vietnamese troops advanced rapidly in early 1975, overrunning key provinces. On April 30, 1975, they entered Saigon, capturing the presidential palace and prompting the unconditional surrender of South Vietnamese President Dương Văn Minh. The event ended the Vietnam War after decades of conflict, with chaotic helicopter evacuations of remaining Americans and allies from the U.S. embassy.

Event DetailUS Military Atlas
1975

Technology20th CenturyGlobal

Apollo and Soyuz Spacecraft Dock in Orbit

Amid Cold War détente, NASA and the Soviet space program collaborated on the Apollo-Soyuz Test Project to develop compatible docking systems for potential future rescues. An Apollo spacecraft launched on July 15, 1975, rendezvoused with Soyuz 19 two days later. On July 17, the crews achieved the first international spacecraft docking, with commanders Thomas Stafford and Aleksei Leonov shaking hands through the hatch in a televised moment of cooperation. They conducted joint experiments, shared meals, and held a news conference over 44 hours docked. The mission concluded the Apollo era on a note of international partnership.

Event DetailDaily Earth View
1975

Exploration20th CenturyGlobal

NASA Launches Viking 1 Mission to Mars

Planetary exploration advanced rapidly in the 1970s as NASA sought to determine whether Mars could support life or had ever done so. The Viking program consisted of two identical spacecraft, each with an orbiter and lander. Viking 1 lifted off from Cape Canaveral on August 20, 1975, aboard a Titan IIIE-Centaur rocket after years of development and testing. The mission carried instruments for imaging, soil analysis, and atmospheric studies. After a 10-month journey, the orbiter entered Mars orbit in June 1976, followed by the lander's successful touchdown on July 20.

Event DetailDaily Earth View
1975

Politics20th CenturyOceania

Papua New Guinea Achieves Independence from Australia

Papua New Guinea had been administered by Australia as separate territories for much of the twentieth century, with the two regions united after World War II. Self-government was granted in December 1973 under Chief Minister Michael Somare. The Papua New Guinea Independence Act, passed by the Australian Parliament, set September 16, 1975, as the date of full sovereignty. On that day, formal independence ceremonies took place in Port Moresby, with Prince Charles representing the British Crown and Australian officials in attendance. Somare became the country’s first prime minister in a peaceful transition that avoided the violence seen in many other decolonization processes.

Event Detail
1975

Disaster20th CenturyNorth America

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 DetailDisaster Kit Pro