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.
1 Remembering Our History: An Overview of the Second Opium War The Second Opium War lasted from 1856 to 1860. 2  It was fought mostly in mainland China and the surrounding oceans over issues related to trade and treaties.