- 1949 4 Apr The North Atlantic Treaty Organisation is signed into existence by its 12 founder nations.
- 1968 4 Apr US civil rights leader Martin Luther King is assassinated by a white supremacist in Memphis, Tennessee.
- 1975 4 Apr Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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