The world’s Arab countries for the first time have joined unanimously in the call for Hamas to lay down its weapons, release all hostages and end its rule of the Gaza Strip, conditions that they said could help the establishment of a Palestinian state. The surprise declaration, endorsed on Tuesday by the 22 member nations of the Arab League, also condemned Hamas’s Oct. 7 attacks on Israel, which set off the devastating war in Gaza. The statement came at a United Nations conference in New York on a two-state solution to end the decades-long conflict between Israelis and Palestinians. “In...