The Boston Red Sox are a professional baseball team based in Boston, Massachusetts. The Red Sox are a member and currently champions of the Eastern Division of Major League Baseball’s American League. From 1912 to the present, the Red Sox have played in Fenway Park. The "Red Sox" name originates from the iconic uniform feature. They are nicknamed "the BoSox," a combination of "Boston" and "Sox" (as opposed to the "ChiSox"), and "the Olde Towne Team." Most fans, however, simply refer to them as "the Sox." One of the American League's eight charter franchises, the club was founded in Boston in 1901. Then known as the Boston Americans, they played at Huntington Avenue Grounds, and met the Pittsburgh Pirates in the first World Series. In 1918, the team won its fifth World Series, and then went into one of the longest championship droughts in baseball history. Many attributed the phenomenon to the "Curse of the Bambino" said to have been caused by the trade of Babe Ruth to the New York Yankees in 1920. The drought was ended, and the "curse" reversed in 2004, when the team won their sixth World Series Championship. The Red Sox lead all other MLB teams in average road attendance, while the small capacity of Fenway causes them to rank 11th in home attendance. Every home game since May 15, 2003 to the present has been sold out, a span of well over four years.