Fortunately, the relationships that exist between marginalization, poverty, conflict and fragility are better understood today, as reflected by the Sustainable Development Agenda, in which States have resolved to “leave no one behind”. No one is left farther behind today than stateless persons, who are often left unable to attend school, to work legally, to open a bank account, or to see a doctor. Their exclusion also affects the prosperity and stability of their communities and societies. Indeed, recent events have unfortunately served to demonstrate all too clearly that statelessness remains a potential cause of social upheaval, conflict and displacement, as well as a grave human rights problem for the individuals concerned. And yet the solutions to statelessness are technically simple ones, as this publication helps to illustrate. The #IBelong Campaign to End Statelessness is now approaching its mid-way point, and more needs to be done by all States to put an end to this blight, once and for all. UNHCR and the IPU hope that the technical guidance provided in this new handbook will help motivate States to undertake the nationality law reforms still needed. 8