The Pennsylvania Polka refers to a series of moves affecting the Philadelphia Eagles and Pittsburgh Steelers franchises in the National Football League (NFL) from 1940 to 1941.
Art Rooney, the owner of the Pittsburgh Steelers, sold his team to Alexis Thompson on December 10, 1940, and subsequently bought a 50% stake in the Philadelphia Eagles franchise from owner Bert Bell. At the time of the deals, a mini-draft took place between the two teams, using a pool of players from both rosters. This resulted in the Eagles acquiring seven players formerly of the Steelers, and the Steelers obtaining eleven players formerly of the Eagles. The 1941 NFL Draft was also held during this time.
Rooney later had second thoughts on the transactions, and made an agreement to swap cities with new Steelers owner Thompson on April 3, 1941. This resulted in the Philadelphia Eagles moving their team to Pittsburgh and becoming the new Pittsburgh Steelers, and the Pittsburgh Steelers moving their team to Philadelphia and becoming the new Philadelphia Eagles. Since NFL franchises at the time were territorial rights distinct from individual corporate entities, the Eagles and Steelers are each officially acknowledged by the NFL as single unbroken entities since 1933, especially since all of these events took place during the offseason. However, the players on the Eagles were basically traded to the Steelers in exchange for their players (with the exception of players who changed teams during the mini-draft, in which case those players "stayed" on the same teams). All players drafted by the Philadelphia Eagles in the 1941 NFL Draft therefore had their rights held by the Pittsburgh Steelers after the final swap, and vice versa.