Introduces the history and nature of international law, and examines the sources of international law-treaties, customary international law, general principles, jus cogens, and equity--and the different forums in which international law is interpreted and applied. Also covers important fields of international law: individual and human rights; recognition and self-determination; war and peace; the United Nations; Antarctica; outer space; the law of the sea; international environmental laws; international conflict of laws; foreign sovereign immunity; and act of state. All chapters have been thoroughly updated. This edition newly examines U.S. cases on the application of international law in the U.S. legal system, the legal regime governing climate change, the proliferation of international courts and tribunals, the responsibility of international organizations for the actions of their agents, and recent developments at the International Criminal Court.