Puerto Rican Immigration at its height between 1950 and 1970
"Puerto Rico and Philadelphia were linked primarily through trade in the 18th and 19th century. Puerto Rican pro-independence exiles and organizers, merchants, cigar makers, trades people, laborers, students, and others lived in Philadelphia between the late 1800s and early 1900s. During World War II, more Puerto Rican men and women, most of who were recruited through a government work program, arrived in the area to work on farms, factories and homes. Between 1950 and 1970, the Puerto Rican community grows dramatically to over 60,000, working in factories and other areas and creating the neighborhoods, businesses, and organization recognized as the Puerto Rican/Latino community today. Since 1970, Puerto Ricans have arrived in Philadelphia from Puerto Rico, New York, and other cities with Puerto Rican communities. Throughout their history in Philadelphia, many Puerto Ricans have practiced circular migration, spending periods of time living in Philadelphia and on the Island."
Quote from Latino Philadelphia at a Glance, Histoprical Society of Pennsylvanian: < http://hsp.org/sites/default/files/legacy_files/migrated/latinophiladelphiaataglance.pdf >
Image source: Wikipedia, Early PR immigrants < http://en.wikipedia.org/wiki/File:EarlyPRimmigrants.gif >