Building on eaglesinmd's fanpost on the Phillies A's Rivalry, this article (MLB History: Saving the Philadelphia Phillies) delves into why it was the A's, and not the Phillies, who moved west in the 1950s.

Why would the team with the rich history leave and the team that had accomplished so little stay in Philadelphia? The change of the baseball culture in Philadelphia and upending half a century of tradition began with the nine months of Phillies ownership by William D. Cox.