Following the collapse of the ASL, soccer in the United States declined in popularity and the country lacked a major professional soccer league. In 1967, two major soccer leagues, the National Professional Soccer League and the United Soccer Association, both began play. The Philadelphia Spartans, owned by Pittsburgh Steelers owner Art Rooney, played at Temple Stadium for the NPSL's lone season. After one season, the NPSL merged with the US to form the FIFA-backed North American Soccer League; the Spartans did not make the jump to the NASL, but two different franchises later represented Philadelphia. The Philadelphia Atoms played from 1973 to 1976, winning the championship in their inaugural season. The Atoms folded after the 1976 season, having been bought by Mexican owners whose plans to move the team to San Antonio were not approved by the league. The Philadelphia Fury played from 1978 to 1980, but were bought by Molson Brewery and moved to Montreal to become the Manic. The Atoms and the Fury both played at Veterans Stadium, though the Atoms played their final season in Philadelphia at Franklin Field. The NASL folded in 1984, leaving the United States without a top-level soccer league until Major League Soccer began play in 1996.