Drawing from discussions that pulled together child researchers working near the borders of Mexico, the United States and Canada, this book explores how material and metaphoric borders give way to young people's experimentations with cultural, social and political change. The contributors highlight the capacities of children to revolutionize thought and practice through creative re-imagining of the boundaries, borders, events, circumstances and familial relations that affect their everyday lives.The first section, in different ways, highlights borders and movements through them as a bricolage of images, symbols, tensions and joys. In the second section, the idea of a portable border is explored in three chapters that consider a migrants' lifecourse, citizenship and political activism respectively. The last section of the book brings together three chapters that uncover how youth resist, confront and transform the borders that envelop their lives. By weaving narratives pertaining to young people's creative stories, transnational migrations, personal identities, pen-pal programs, masculinites, inter-generational change, border crossings, political activism and addictions, the contributors in toto raise the idea of young people taking bounded and embodied events, places and institutions and moving them towards something emancipatory sin fronteras - without borders.This book was published as a special issue of Children's Geographies.