Definition of Foreign states
Nations which are outside the United States. Term may also refer to another state; i.e. a sister state.
The term "foreign nations,” as used in a statement of the rule that the laws of foreign nations should be proved in a certain manner, should be construed to mean all nations and states other than that in which the action is brought; and hence one state of the Union is foreign to another, in the sense of that rule.
A "foreign state” within statute providing for expatriation of American citizen who is naturalized under laws of foreign state is a country which is not the United States, or its possession or colony, an alien country, other than our own. Kletter v. Dulles, D.C.D.C., 111 F.Supp. 593, 598.
That's the definition of Foreign states in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.
