"The main object of the opening sentence of the Fourteenth Amendment was to settle the question, upon which there had been a difference of opinion throughout the country and in this court, as to the citizenship of free negroes, Scott v. Sandford, . . . and to put it beyond doubt that all persons, white or black, and whether formerly slaves or not, born or naturalized in the United States, and owing no allegiance to any alien power, should be citizens of the United States, and of the State in which they reside. .. The evident meaning of these last words is not merely subject in some respect or degree to the jurisdiction of the United States, but completely subject to their political jurisdiction, and owing them direct and immediate allegiance. .. To be “completely subject” to the political jurisdiction of the United States is to be in no respect or degree subject to the political jurisdiction of any other government. .. the children of aliens, whose parents have not only not renounced their allegiance to their native country, but are forbidden by its system of government, as well as by its positive laws, from doing so, and are not permitted to acquire another citizenship by the laws of the country into which they come, must necessarily remain themselves subject to the same sovereignty as their parents, and cannot, in the nature of things, be, any more than their parents, completely subject to the jurisdiction of such other country. .. the Fourteenth Amendment undoubtedly had particular reference to securing citizenship to the members of the colored race, whose servile status had been obliterated by the Thirteenth Amendment and who had been born in the United States, but were not and never had been subject to any foreign power. .. When, then, children are born in the United States to the subjects of a foreign power, with which it is agreed by treaty that they shall not be naturalized thereby, and as to whom our own law forbids them to be naturalized, such children are not born so subject to the jurisdiction as to become citizens .. consent to allow such persons to come into and reside within our geographical limits does not carry with it the imposition of citizenship upon children born to them while in this country under such consent, in spite of treaty and statute. .. the Fourteenth Amendment does not exclude from citizenship by birth children born in the United States of parents permanently located therein, and who might themselves become citizens; nor, on the other hand, does it arbitrarily make citizens of children born in the United States of parents who, according to the will of their native government and of this Government, are and must remain aliens."