If not "birthright" citizenship, what?

For people who would like to end "birthright" citizenship (which I prefer to think of as "constitutionally guaranteed citizenship"), what is the alternative? If a U.S. birth certificate isn't enough for someone to prove U.S. citizenship, what would be required? The birth certificates of the parents? But they would just be birth certificates, too, even if they were born in the U.S. A family geneology? Would Immigration investigate every birth? Most birth certificates are issued by city and county authorities. Would they be replaced by a national birth certificate issued only to people who have been determined to be citizens (back to question 1)? Etc. It really starts to look, as with the "voter ID" business, like a way to exclude people from the political process. How would an end to "birthright" citizenship actually work?

via International Skeptics Forum http://ift.tt/1JfVcKS