foreign nation

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
FOREIGN NATION or STATE. A nation totally independent of the United States 
of America 
     2. The constitution authorizes congress to regulate commerce with 
"foreign nations." This phrase does not include an Indian tribe, situated 
within the boundaries of a state, and exercising the powers of government 
and sovereignty. 5 Pet. R. 1. Vide Nation. 
    

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