Abstract

This paper considers the philosophical foundations of the law relating to migration. It examines the kinds of reasons that might justify the restriction of liberty as people move about on the face of the earth—something humans have done since time immemorial. The paper also examines the various interests that might be at stake in moral calculations regarding migration: economic interests, cultural interests, religious interests, or just sheer preferences. Drawing on the work of Locke, Kant, and Sidgwick, it considers conceptions like common ownership of the earth, the right of hospitality, and the difference between defending property and restricting access to economic interaction. The paper also considers the ambiguity of the commonly heard slogan that states by definition have a right to control their borders.