The Chicago White Sox are a professional baseball team based in Chicago, Illinois. They are a member of Major League Baseball's American League Central Division. Founded in 1900, the team has a rich history and has won three World Series championships, with their most recent title in 2005. The White Sox play their home games at Guaranteed Rate Field, which opened in 1991. The team's colors are black, white, and silver, and they are known for their passionate fan base. The White Sox have a strong rivalry with the Chicago Cubs, known as the Crosstown Classic.