Holocaust survivors and the heirs of Holocaust victims filed a suit in U.S. Federal District Court against the Hungarian National Railway, the Hungarian national bank, and several private Hungarian banks (the "Defendants"). The holocaust survivors claim the defendants participated in expropriating the property of the holocaust victims during the war 70 years ago. The Holocaust survivors did not seek remedies through the Hungarian court system. The Defendants ask the U.S. Federal District Court to dismiss the lawsuit.

Should the U.S. Federal District Court dismiss the lawsuit? Explain the legal principles that support your answer.