Which territory did the Mongol Empire conqueror after Genghis Khan's death​

Ögedei Khan, Genghis Khan 's third son, ruled the Mongol Empire from 1227 CE-1241 CE. Under Ögedei, the Mongol Empire conquered Eastern Europe by invading Russia and Bulgaria; Poland, at the Battle of Legnica; and Hungary, at the Battle of Mohi.

answer; i believe that the correct answer is (d); //declaration of independence; plz check first good luck

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers