Hilton v. Guyot, , was a case decided by the United States Supreme Court in which the court described the factors to be used when considering the application of comity

Comity

In law, comity specifically refers to legal reciprocity—the principle that one jurisdiction will extend certain courtesies to other nations , particularly by recognizing the validity and effect of their executive, legislative, and judicial acts...

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Opinion of the Court

Justice Fuller said, "Now the rule is universal in this country that private rights acquired under the laws of foreign states will be respected and enforced in our courts unless...." reference Ray August 'International Business Law' p148