The Pentagon, in Arlington County, Virginia, just across the Potomac from Washington, D.C., is the headquarters of the United States Department of Defense. Its five-sided shape, which gave it its name, was designed by the architect George Bergstrom under great time pressure as the United States prepared for the Second World War. Construction began in September 1941 and was overseen by the Army officers Brehon Somervell and Leslie Groves, who later led the Manhattan Project. When finished it was among the largest office buildings in the world, housing tens of thousands of workers. On 11 September 2001, hijackers flew an airliner into its western side, killing everyone aboard and many inside the building.
Before and after
- from 1943 to 1945Alsos Mission
- 1943Rise of objectivism
- 1943Creation of Colossus
- 7 January 1943Death of Nikola Tesla
- 15 January 1943Construction of The Pentagon
- from 29 January 1943 to 30 January 1943Battle of Rennell Island
- from 10 February 1943 to 13 February 1943Battle of Krasny Bor
- from 14 February 1943 to 17 February 1943Battle of Sidi Bou Zid
- 14 February 1943Death of David Hilbert
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The era
This moment belongs to the Modern era (1914 CE to 1945 CE), world wars and a changing world. You can also browse everything in the 20th century.