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While the franchises in the four major U.S. sports may seem like long-standing and solid institutions, many teams have failed or disappeared over the years. But before these teams went away, many of them were very successful on the court, rink, or field, winning lots of games and bringing home championships for their fans.24/7 Wall St. reviewed historical win-loss records and championship counts from the Sports Reference family of sites to determine the greatest pro sports teams that disappeared. For similar lists visit 24/7 Wall St. .