President Obama and his family will arrive Sunday in Cuba for an historic three-day visit filled with symbolism, but with few expectations that the president’s legacy-building will improve human rights for Cubans under the repressive communist regime of the Castro brothers. Air Force One will land at Jose Marti International Airport near Havana late Sunday afternoon, making Mr. Obama the first sitting U.S. president to set foot on Cuban soil since Calvin Coolidge in 1928. After a stop at the U.S. Embassy, the Obamas are to visit the Cathedral in Old Havana to meet Cardinal Jaime Ortega, the archbishop who...