Is Jerusalem part of Israel?

Over at the Hoover Institution’s Defining Ideas, Richard Epstein deliberates over the arguments in the case pending before the Supreme Court on the constitutionality of the statute that provides: “For purposes of the registration of birth, certification of nationality, or issuance of a passport of a United States citizen born in the city of Jerusalem, the Secretary [of State] shall, upon the request of the citizen or the citizen’s legal guardian, record the place of birth as Israel.”
You have a problem with that? My guess is that one will learn more from Professor Epstein’s column than from the Supreme Court’s ultimate decision in the case of Zivotofsky v. Clinton.