The idea comes from the simple fact that they share blood. Puerto Ricans are a mixed breed.
"Recent DNA sample studies have concluded that the three largest components of the Puerto Rican genetic profile are in fact indigenous Taino, European, and African with an estimated 62 per cent of the population having a indigenous female ancestor.
Afro-Puerto Ricans constitute the largest minority group. "
"Sociological studies from the 1950s onwards have suggested that Afro-Puerto Ricans are disproportionately present in deprived urban neighbourhoods, low-paid informal-sector employment and youth detention centres."
http://www.minorityrights.org/5258/puerto-rico/puerto-rico-overview.html#peoples
"61% of Puerto Ricans have significant Taino ancestry and 46% of Puerto Ricans having significant African ancestry, many are racially mixed, with most people having varying degrees of European, African, and Taino ancestry"
"The
Puerto Rico of today has come to form some of its own social customs, cultural matrix, historically-rooted traditions, and its own unique pronunciation, vocabulary, and idiomatic expressions within the
Spanish language. Even after the attempted assimilation of Puerto Rico into the United States in the early 20th century, the majority of the people of Puerto Rico feel pride in their nationality as "Puerto Ricans", regardless of the individual's particular racial, ethnic, political, or economic background. Many Puerto Ricans are consciously aware of the rich contribution of all cultures represented on the island. This diversity can be seen in the everyday lifestyle of many Puerto Ricans such as the profound Latin, African, and Taíno influences regarding food, music, dance, and architecture."
http://en.wikipedia.org/wiki/Puerto_Rican_people
? We doing it for us and by us in cities like ATL, DC, and Houston.
some of the time and relax.
Color me shocked. 
