A third of humanity is on the move. History's largest migration is creating new urban spaces that are this century's focal points of conflict and change unseen centres of febrile activity that will reshape our cities and reconfigure our economies. These arrival cities are where the next great economic and cultural boom will be born, or where the next explosion of violence will occur. The research and investigative discoveries draw on the latest developments in scholarship and will change our views of migration, cities, population growth, foreign aid and politics, This book embarkers on a detailed tour of thirtycities and villages on five comments, introducing the people and communities whose trageties and victories are changing the world.