Academic tenure was put in place in U.S. school systems in the first half of the 20th century to protect teachers from arbitrary punishment, but in the last several decades it has morphed into something else altogether.
More facts about short wars: 1  The second-shortest war in recorded history occurred during the 20th century. Launched on 5 June 1967, the Six Day War was the result of Egypt calling for Arab nations to take action against Israel after leaders in that nation made threats against the country of Syria.
The Second Battle of Ypres was a battle of the First World War. It was fought for control of the town of Ypres in western Belgium. It happened in the spring of 1915. It was the first time that Germany successfully used chemical weapons on a large scale on the Western Front.