Last week we made note of two events of importance to American agriculture that took place 50 years ago in 1963.  One was the referendum in which U.S. wheat farmers voted down a proposal for mandatory restrictions on the amount of wheat acreage each farmer could plant in exchange for a "high" $2.00/bushel price support.  There were to be harsh penalties for non-compliers. It was the first time that U.S. farmers rejected a government supply management proposal.The second event we recalled from 1963 was the first major sale of U.S. wheat to the Soviet Union at the height of the Cold War approved by President Kennedy shortly before he was assassinated. His approval unfortunately contained the proviso that 50 percent of any tonnage...