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THE AMERICAN JOURNAL OF INTERNATIONAL LAW
[Vol. 105:694
In this sense, emerging international norms regarding national membership show how far
international law has come. Community self-definition is constitutive and foundational in the
sense that it is prior to any act of the community; what states do is determined by the individuals
who compose them. If citizenship practices are not immune to international legal constraint,
then nothing is. Nationality law is the last bastion in the citadel of sovereignty. That is not to
say that international law now delivers a comprehensive regulatory regime. States will retain
important discretionary powers into the future. But no function of governance will be shielded
from international law as a categorical matter, membership decisions included.
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