We know what happened in the spring of 1972: Five men broke into the Democratic National Committee headquarters, were caught and arrested, and triggered the slow-dripping scandal that became known as Watergate.But a full understanding of President Richard Nixon wouldn’t be possible without the events that came before Watergate, when the stress of the presidency—the anti-Vietnam demonstrations, the secret bombing and invasion of Cambodia, the deaths of four student protesters at Kent State, became too much.