Interference by the National and American Leagues in their operations caused the Federal League to fold after the 1915 season. This resulted in a landmark federal lawsuit, "Federal Baseball Club v. National League", in which the U.S. Supreme Court ultimately ruled that the Sherman Antitrust Act did not apply to Major League Baseball. The Federal League left its mark on baseball history in the field now known as Wrigley Field, which was originally built for the Chicago Whales Federal League team. The league itself and many sports writers considered it a major league during its existence; organized baseball recognized its major league status in 1968. Not including certain periods of the Negro leagues, it would be the last independent major league outside the established structure of professional baseball to make it to the playing field, and would be the last serious attempt to create a third major league until the abortive Continental League of 1960.