WHAT ALL HAPPENED JANUARY TO MAY 1975
Find out what all happened January to May 1975

In London an underground train fails to stop at Moorgate terminus station and crashes into the end of the tunnel, killing 43 people. (28. February 1975)

Bobby Fischer refuses to play in a chess match against Anatoly Karpov, giving Karpov the title of World Champion by default. (3. April 1975)

Mayagüez incident: the Cambodian navy seizes the American merchant ship SS Mayaguez in international waters. (12. May 1975)

Faisal of Saudi Arabia is shot and killed by a mentally ill nephew. (25. March 1975)

Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico (4. April 1975)

The Soyuz 17 Soviet spacecraft returns to Earth. (9. February 1975)

Vietnam War: Ho Chi Minh Campaign - North Vietnamese troops attack Ban Me Thuot, South Vietnam, on their way to capturing Saigon on the final push for victory over South Vietnam. (10. March 1975)

Vietnam War: Operation Baby Lift – A United States Air Force Lockheed C-5A Galaxy transporting orphans, crashes near Saigon, South Vietnam shortly after takeoff; 172 die. (4. April 1975)

Vietnam War: President of South Vietnam Nguyen Van Thieu flees Saigon, as Xuan Loc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls. (21. April 1975)

India annexes Sikkim after the mountain state holds a referendum in which the popular vote is in favor of merging with India. (16. May 1975)

A bomb blast at Samastipur, Bihar, India, fatally wounds Minister of Railways Lalit Narayan Mishra. (2. January 1975)

Vietnam War: North Vietnamese and Viet Cong guerrilla forces establish control over Ban Me Thuot commune from the South Vietnamese army. (11. March 1975)

A crucial by-election is held in Kankesanthurai, Sri Lanka. (6. February 1975)

The Cambodian Civil War ends. The Khmer Rouge captures the capital Phnom Penh and Cambodian government forces surrender. (17. April 1975)

Bus massacre in Lebanon: An attack by the Phalangist resistance kills 26 militia members of the Popular Front for the Liberation of Palestine, marking the start of the 15-year Lebanese Civil War. (13. April 1975)

Sony introduces the Betamax videocassette recorder in Japan. (10. May 1975)

Construction of the CN Tower is completed in Toronto, Ontario, Canada. It reaches 553.33 metres (1,815.4 ft) in height, becoming the world's tallest free-standing structure. (2. April 1975)

The Monitor National Marine Sanctuary is established as the first United States National Marine Sanctuary. (30. January 1975)

An earthquake strikes Himachal Pradesh, India (19. January 1975)

Teenage heiress Lesley Whittle is kidnapped by Donald Neilson, aka "the Black Panther". (14. January 1975)