The 1960s were a heady time to come of age. The British Invasion transformed pop music and culture. The fledgling space program offered a thrilling display of modern technology. The civil rights movement and Vietnam War drew young people to American politics, spurring them to think more critically about the state of the nation. And the assassinations Martin Luther King Jr. and Robert F. Kennedy in 1968 shook the United States to the core. During these...