One striking thing about sports history is how successful teams from Philadelphia have been compared to teams from New York. This is of course most striking with Major League baseball, where you have the record 27 World Series wins by the Phillies compared to just one World Series win each for the Yankees and the Mets (before they left New York, the Giants won five titles, equal to the Athletics when they were in Philly, of course the Dodgers never won anything before they moved to LA). The Yankees recently became the first team to lose 10,000 games.
Even with the NFL, no New York area team has ever won a Superbowl, compared to five for the Eagles.
What would be the minimum number of changes to make sports teams from New York as dominant as the teams from Philly turned out to be?