A stark reality faces the vice president as she visits the region: Expanding aid programs have failed to stem migration. An American contractor went to a small town in the Guatemalan mountains with an ambitious goal: to ignite the local economy, and hopefully even persuade people not to migrate north to the United States. Half an hour into his meeting with coffee growers, the contractor excitedly revealed the tool he had brought to change their lives: a pamphlet inviting the farmers to download an app to check coffee prices and “be a part of modern agriculture.” Pedro Aguilar, a coffee...
