Union general George B. McClellan was put in command of the Army of the Potomac during the Civil War.
Billboard magazine published its first singles record chart (for the week of July 20).
An armistice was signed ending the Korean War.
The House Judiciary Committee voted to impeach Richard Nixon for obstructing justice in the Watergate case.
The Korean War Veterans Memorial was dedicated in Washington, DC.
A pipe bomb exploded in an Atlanta park during the Olympic Games.
Lance Armstrong won his fifth straight Tour de France, tying Miguel Indurain's record.
The 2012 Summer Olympics began in London.