In 1853 a case arose in which the United States affirmed: "It is a maxim of international law that domicile confers national character; ... international law looks only to the national character in determining what country has the right to protect. If a person goes from this country abroad, with the nationality of the United States, this law enjoins upon other nations to respect him, in regard to protection, as an American citizen."[175] This statement was made in support of the position assumed by the United States in the case of one Martin Koszta. Koszta, a Hungarian refugee of 1848-1849, went to Turkey, was imprisoned, later was released on condition of leaving the country, went to the United States, declared his intention to become a citizen, and in 1853 returned to Turkey. He went into business at Smyrna, obtained there a traveling pass certifying that he was under protection of the United States, was seized, thrown into the sea by persons employed by the Austrian consulate, and was picked up by an Austrian man-of-war, _Hussar_. The consul of the United States remonstrated, but the captain of the _Hussar_ held Koszta. The chargé d'affaires requested the aid of a United States man-of-war, whose captain demanded Koszta's release. To avoid conflict in the port the mediation of the French consul was accepted, and Koszta was intrusted, pending settlement of claims, to the French consul. Finally Koszta was allowed to return to the United States, though Austria maintained her right to proceed against him if he returned to Turkey. The United States in this case undoubtedly took an extreme position in its claim of jurisdiction.
By an act of March 3, 1863, the United States declared that those who had taken the preliminary oath of intention to become citizens were liable to military service. Upon protest by foreign nations against this act of Congress, the President, by proclamation, announced that, as it had been claimed that "such persons, under treaties or the law of nations, retain a right to renounce that purpose, and to forego the privileges of citizenship and residence within the United States, under the obligations imposed by the aforesaid act of Congress,"[176] to avoid all misapprehension, the plea of alienage would be accepted for sixty-five days, during which time such persons as had only declared their intention to become citizens might depart.