>>1327797It's pretty simple honestly.
>Philly was a manufacturing city>Manufacturing started to leave in the 70's>the 80s continued this (the 80s were also terrible for all US cities)>why would you stay when there are no more jobs>only since like 2008 has this trend reversed and Philly has become a city that people want to move too now.Here's a sorta recent pic I took while riding PATCO when it was foggy.