To understand why this occurred and what it means for American culture, one must study the fractious history of the mental health field over the last six decades. It is a complicated story, with a staggering variety of terms, schools, leaders, and techniques, so any overview must necessarily leave out many important details. But from even just a synopsis of the conflicts that gave rise to today's culture of psychotherapy — battles over who would hold the truest title to physician of the mind, tensions between scientists and clinicians, academics and professionals, elites and the public — we can see more clearly how psychotherapy has profoundly shaped the American conception of what happiness is and how we can achieve it.