This Wednesday marks the 100th anniversary of the birth of Richard Nixon. Conventional wisdom says Nixon was brought down by Watergate. The reality was that he was undone as much by the divisiveness of the Vietnam years as by any of the marked and material flaws in his character. Distrust of the Washington establishment and of the ugly, costly war into which it had mismanaged America created a polarized, volatile atmosphere. Nixon gave his enemies the sword they needed to undo him and produce the kind of wrenching change the era seemed to demand.