AS we were reminded last summer when thousands of unaccompanied children showed up on our southwestern border, the security and prosperity of Central America are inextricably linked with our own. The economies of El Salvador, Guatemala and Honduras remain bogged down as the rest of the Americas surge forward. Inadequate education, institutional corruption, rampant crime and a lack of investment are holding these countries back. Six million young Central Americans are to enter the labor force in the next decade. If opportunity isn’t there for them, the entire Western Hemisphere will feel the consequences.