Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled，That any person who is the head of a family，or who has arrived at the age of twenty-one years，and is a citizen of the United States，or who shall have filed his declaration of intention to become such，as required by the naturalization laws of the United States，and who has never borne arms against the United States Government or given aid and comfort to its enemies，shall，from and after th