A latchkey kid is a child who returns after school to a house empty of parents. The child's parents are both working. This situation was first seen during the Second World War. Men where drafted into the armed forces, and many women were working in factories or on the land. Later, as mothers began to work regularly, latchkey children became common again in the 1960s and following years. Libraries also found they had kids arrive for a couple of hours after school.