This chapter continues to investigate whether the three core values defended in this book (occupancy, basic justice, and collective self-determination) can justify states’ exclusionary claims to border control. This chapter focuses on what we might call opportunity migrants, those who are not suffering from persecution, persistent violations of their basic human rights (including subsistence rights), environmental devastation, or cultural or political oppression. Can states exclude migrants whose fundamental territorial interests are not at stake? What about travelers, students, economic migrants, and so on? The chapter argues that a state may exclude immigrants of this sort only where it can offer a plausible case that their entry would cause harm.