Not necessarily true about NYC. Pre mass-transit, wealthy citizens of Manhattan vacationed on the northern part of the island. During the early 20th century, as

Not necessarily true about NYC. Pre mass-transit, wealthy citizens of Manhattan vacationed on the northern part of the island. During the early 20th century, as the subway system and metro-north were developed, these same people migrated to the north, or what is now referred to as Westchester. While easterlies may have caused dislocation during a certain time period, most major cities have experienced other events which have also had a significant impact on their demography.