Bastien Inzaurralde and Brandon Quester: Hundreds of children roam the streets of Santo Domingo. Some are Dominican and some Haitian. Many are both. But few know how to legally prove their citizenship.

Bastien Inzaurralde: Waterborne diseases — often the result of poor sanitation and lack of treated, drinkable water — that are a rarity elsewhere are common in Independencia, the poverty-stricken province where Batey 9 is located, near the border with Haiti.