Citizenship is a matter of unquestionable but ambiguous constitutional significance. Section 1 of the Fourteenth Amendment begins by announcing, [a]ll persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. Only after this framing announcement does Section 1 declare the protections of the privileges or immunities, due process, and equal protection clauses. The few academics who focus on this first sentence maintain that it is a source or a framing mechanism for the recognition of individual rights. Professor Kenneth Karst, the leading contemporary theorist,argues that the Fourteenth Amendment\u27s citizenship clause, read with the ba...