What legal principles govern the external exercise of the public power of states within common law legal systems? Foreign Relations Law tackles three fundamental issues: the distribution of the foreign relations power between the organs of government; the impact of the foreign relations power on individual rights; and the treatment of the foreign state within the municipal legal system. Focusing on the four Anglo-Commonwealth states (the United Kingdom, Australia, Canada and New Zealand), McLachlan examines the interaction between public international law and national law and demonstrates...