Asked to name an activist, many people think of someone like Cesar Chavez or Rosa Parks—someone uniquely and passionately devoted to a cause. Yet, two-thirds of Americans report having belonged to a social movement, attended a protest, or engaged in some form of contentious political activity. Activism, in other words, is something that the vast majority of people engage in. This book examines these more common experiences to ask how and when people choose to engage with political causes.