This league was the only one to challenge the supremacy of the National Football League by luring star players such as Joe Namath. The two leagues merged in 1970 and all the AFL teams survived and become the American Football Conference of the NFL.
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2.
American Basketball Association 1967-76
The ABA was a hit in the 1970s for its faster style of play than the NBA. The two leagues merged with many ABA teams surviving and becoming part of the new NBA.
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3.
All-American Girls Professional Baseball League 1943-1954
The league was portrayed in the hit movie "A League of Their Own"
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4.
United States Football League 1983-85
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5.
NFL Europe 1991-2007
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6.
World Hockey Association 1972-79
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7.
Major Indoor Soccer League 2001-08
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8.
American Football Association (Soccer) 1896-1907
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9.
All-American Football Conference 1946-49
Member teams Cleveland Browns, Baltimore Colts and San Francisco 49ers were admitted into the National Football League.
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10.
International Hockey League 1945-2001
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11.
American Basketball League (Men) 1925-55
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12.
National Basketball League 1937-49
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13.
American Basketball League (Women) 1996-98
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14.
Senior Professional Baseball Association 1989-90
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15.
World Basketball League 1988-92
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16.
XFL 2001
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17.
Professional Slow Pitch Softball League 1977-82
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18.
National Lacrosse League 1974-75
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19.
Roller Hockey International 1993-97
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20.
Negro American League 1937-1950
Many of the greatest baseball players ever, including Satchel Paige and Josh Gibson, played in the Negro Leagues until Major League Baseball allowed African-American players.