President Obama is voicing support for a U.N. resolution that could accomplish something as radical as relinquishing some U.S. sovereignty and opening a path for the return of ancient tribal lands to American Indians, including even parts of Manhattan. The issue is causing alarm among legal experts. In recent remarks at the White House during a "tribal nations conference," Obama endorsed the "United Nations Declaration on the Rights of Indigenous People," which includes a sweeping declaration that "indigenous peoples have a right to lands and resources they traditionally occupied or otherwise used" but that later were acquired by occupying forces....