For 72 years, U.S. presidents sought to achieve peace between Israel and the Arab world. For 72 years, they largely failed.

What for so long eluded presidents from Dwight D. Eisenhower to Barack Obama seems to have come effortlessly to President Donald Trump. In the space of just four months, together with Israeli Prime Minister Benjamin Netanyahu, Trump has achieved four peace deals between Israel and Arab states—twice the number achieved by all his predecessors combined. Last Thursday, Trump announced Morocco has joined the United Arab Emirates, Bahrain and Sudan in the Abraham Accords norma...