Other football teams in the city have folded. In 1902 the owners of the three MLB teams in Pennsylvania founded the National Football League (a league unrelated to the modern NFL). The league consisted of the Phillies, Athletics, and the Pittsburgh Stars, and lasted only one year. Many of the players from the Philadelphia teams played for the "New York Philadelphians" during the 1902 World Series of Football. Other early football clubs include the Union Club of Phoenixville, Conshohocken Athletic Club, Union Quakers of Philadelphia, and Holmesburg Athletic Club. The Clifton Heights Orange & Black competed from 1921 to 1932, and played in the short-lived Eastern League of Professional Football. The Philadelphia Bulldogs played in the Continental Football League from 1965 to 1966. They won the 1966 championship. The Pottstown Firebirds competed in the Atlantic Coast Football League from 1968 to 1970; the franchise was an affiliate of the Philadelphia Eagles.