The law of continental Europe is thus described by Vattel: “Children naturally follow the condition of their parents.” (Qu. Morse on Citizenship, p. 28.) Mr. Campbell does not propose to change the law (sec. 1993, R. S.) by which children who are born abroad of fathers who are citizens of the United States, whether by birth or naturalization at the time of the birth of the children, are citizens, but would specifically shut out from our citizenship all the children born abroad before the parents became American citizens, no matter when they may come here.