Final answer:
In U.S. law, if a treaty and federal statute conflict over a domestic issue, then the measure that is later in time usually prevails due to the Supremacy Clause.
Step-by-step explanation:
In the United States' legal construct, when a treaty conflicts with a federal statute over a purely domestic issue, the 'measure that is later in time usually prevails'. This rule is derived from the Supremacy Clause of the Constitution (Article VI, Section 2), which states that treaties and federal laws are the 'supreme Law of the Land'. Therefore, if a federal law (statute) is enacted after the establishment of a treaty and the two conflict, the newer federal law will prevail in a domestic context.
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