Lyndon Baines Johnson didnÕt just stumble into the White House. He was hurled there on a Friday afternoon in November 1963, inside a airplane that smelled of jet fuel and shock. Two hours earlier, John F. Kennedy had been shot in Dallas. Johnson, a big, restless Texan with jug ears and a nose that looked like it had been in a few arguments, took the oath of office next to a nervous Jackie Kennedy, her pink suit still stained with blood. That image is the hinge of modern American history. JohnsonÕs presidency is a story of two giant, contradictory drives. One was his fierce, almost biblical commitment to social justice. He grew up poor in the Texas Hill Country, teaching Mexican American children in a segregated school. He never forgot the sight of barefoot kids with nothing to eat. As president, he launched the Great Society, a wave of legislation that reshaped daily life for millions. The Civil Rights Act of 1964 ended legal segregation in public places. The Voting Rights Act of 1965 finally gave Black Americans in the South the ballot. He created Medicare and Medicaid, health insurance for the old and the poor. He poured federal money into schools, highways, and public broadcasting. When he signed these bills, he often handed out dozens of pens as souvenirs, grinning like a man who had just wrestled a bear and won. The other drive was his fear of looking weak on communism. Johnson inherited Vietnam from Kennedy and chose to escalate. By 1965, he had sent hundreds of thousands of American soldiers to fight a guerrilla war in a country most voters couldnÕt find on a map. He thought he could bomb the North and build a nation in the South. Instead, the war became a quagmire. Every night on the evening news, Americans saw body counts and burning villages. The same president who gave poor people a lifeline also sent 58,000 young Americans home in coffins. Johnson hated the war privately. He once told an aide, ÒI feel like a hitchhiker caught in a hailstorm. I canÕt run, I canÕt hide, and I canÕt make it stop.Ó But he couldnÕt pull out either. By 1968, the country was coming apart. Riots exploded in cities after Martin Luther King Jr. was shot. Protests rocked college campuses. In March, Johnson went on live television and announced he would not run for reelection. He said he wanted to focus on peace, but the truth was more raw. The job had broken him. He retreated to his Texas ranch, where he died of a heart attack in 1973, just as the last helicopters lifted off the Saigon roof. History has never quite known what to do with Johnson. He was a bully and a visionary, a deal maker who could twist arms and whisper promises, a man who built a Great Society while burning one down in the jungle. He is not a simple hero or a simple villain. He is a human monument to how one person can do immense good and immense harm, often at the same time, often with the very best and very worst intentions tangled together in his chest.