Ronald Reagan had the position of president.
Ronald Reagan . He twice ran unsuccessfully for the Republican nomination for the U.S. presidency in 1968 and 1976 ; four years later , he easily won the nomination outright , becoming the oldest elected U.S. president up to that time , defeating incumbent Jimmy Carter in 1980 . Reagan 's presidency came during the decline of the Soviet Union and just ten months after the end of his term , the Berlin Wall fell , and on December 26 , 1991 , nearly three years after he left office , the Soviet Union collapsed .