Grand Slam of Sports: Cities with NFL, MLB, NBA, NHL; which will be 1st to be champion in all 4 the same year?

Which of the 13 cities that have the Grand Slam of Sports (An NFL football team(s); MLB baseball team(s); NBA basketball team(s); NHL hockey team(s)) will be the first city to have the champion for each sport all in the same year and why? Cities with Grand Slam of sports listed in alphabetical order and team names: Atlanta (Falcons; Braves; Hawks; Thrashers). Boston/New England (Patriots; Red Sox; Celtics; Bruins). Chicago (Bears; Cubs/White Sox; Bulls; Blackhawks). Dallas area (Cowboys; Rangers; Mavericks; Stars). Denver, Colorado (Broncos; Rockies; Nuggets; Avalanche). Detroit (Lions; Tigers; Pistons; Red Wings). Miami, Florida (Dolphins; Marlins; Heat; Panthers). Minneapolis--Saint Paul, Minnesota (Vikings; Twins; Timberwolves; Wild). New York City area (Giants/Jets; Mets/Yankees; Knicks/Nets; Devils/Islanders/Rangers). Philadelphia (Phillies; Eagles; 76ers; Flyers). Phoenix, Arizona area (Cardinals; Diamondbacks; Suns; Coyotes). San Francisco Bay area (49ers/Raiders; Athletics/Giants; Warriors; Sharks). Washington, DC (Redskins; Nationals; Wizards; Capitals).