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NEW YORK — For over a century now, Zionism and Arab nationalism have failed to find an accommodation in the Holy Land. Both movements attempted to fill the space left by collapsed empire, and it has been left to the quasi-empire, the United States, to try to coax them to peaceful coexistence. The attempt has failed.

President Barack Obama came to office more than a year ago promising new thinking, outreach to the Muslim world, and relentless focus on Israel-Palestine. But nice speeches have given way to sullen stalemate. I am told Obama and the Israeli prime minister, Benjamin Netanyahu, have a zero-chemistry relationship.

Domestic U.S. politics constrain innovative thought — even open debate — on the process without end...