Palestinians marched in the West Bank and Gaza on Thursday to commemorate their displacement in the 1948 Mideast war that followed the establishment of the state of Israel. Sirens wailed at noon in Ramallah and elsewhere across the West Bank for 66 seconds to symbolize the number of years since the “Nakba,” or “catastrophe” in Arabic—the term Palestinians use to describe their defeat and displacement in the war. Israel overcame the armies of surrounding Arab states as well as local Arabs who attacked after the Jewish state was declared on May 15, 1948. […] “It is time for the leaders...