Each day, Benzinga takes a look back at a notable market-related moment that occurred on this date. What Happened? On May 31, 2007, Wachovia bought A.G. Edwards for $6.8 billion. Where the Market Was The Dow closed at 13,627.64. The S&P 500 traded at around 1,530.62. What Else Was Going on in the World? In…