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In page Human rights in the United States:

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Under the principle of pacta sunt servanda, a country may not invoke provisions of its domestic laws or constitution as justification for failure to comply with its international law obligations. Therefore, if a human rights treaty has been ratified by the U.S. but is not considered self-executing, or has not yet been implemented by legislation, it is nonetheless binding on the U.S. government as a matter of international law.[citation needed]