"In The Collapse historian Mary Elise Sarette shows that the opening of the Berlin Wall on November 9, 1989, was not, as is commonly believed, the East German government's deliberate concession to outside influence. It was an accident. A carelessly worded memo written by mid-level bureaucrats, a bumbling press conference given by an inept member of the East German Politburo, the negligence of government leaders, the bravery of ordinary people in East...