Ulbricht and then Erich Honecker.
This country's neighbor tried to prevent other countries from recognizing it through the   Hallstein [HAHL-shteen] Doctrine. For most of the time this country existed, Erich Mielke [AIR-ikh  MIL-keh] headed its dominant secret police force, the Stasi [SHTAH-see]. This country was ruled by   a State Council after the death of its only president, Wilhelm Pieck [VIL- helm PEEK]. For many  years, that council was headed by Walter [VAL-tair] Ulbricht and then Erich Honecker. This country  started as the occupation zone agreed to at the Yalta Conference under the control of the Soviet  Union. Name this country that merged with its neighbor in 1990 following the fall of the Berlin Wall.
This country's neighbor tried to prevent other countries from recognizing it through the   Hallstein [HAHL-shteen] Doctrine.
East Germany [or German Democratic Republic or GDR or Ostdeutschland; do  not accept or prompt on “Germany” or “Deutschland”]