"When she was only nine, Dayani Baldelomar left her Nicaraguan village with nothing more than a change of clothes. She was among tens of thousands of rural migrants to Managua in the 1980s and 1990s. After years of homelessness, Dayani landed in a shantytown called The Widows, squeezed between a drainage ditch and putrid Lake Managua. Her neighbor, Yadira Castell?n, also migrated from the mountains. Driven by hope for a better future for their children,...