John F. Kennedy advised Americans to ask not what their country could do for them, but what they could do for their country. Scholar Danielle Allen argues that civic engagement such as Kennedy was suggesting is the only true path to a just society—a framework she refers to as “power-sharing liberalism.” While liberalism more generally is the idea that a government should be based on rights that both protect and empower individuals, Allen’s proposed framework calls for a country in which no si...