Question

in 1956, people in demanded that soviet troops be removed as part of a call for democratic reforms. poland russia hungary cuba

Explanation:

In 1956, the Hungarian Revolution (or Uprising) occurred where people demanded democratic reforms and the removal of Soviet troops. Poland's 1956 events (Polish October) were more about internal reform within the communist system without demanding Soviet troop removal. Russia was part of the Soviet Union, so it wouldn't demand Soviet troop removal. Cuba's major revolutionary events with Soviet involvement were later (Bay of Pigs, Cuban Missile Crisis era). So Hungary is the correct answer.

Answer:

Hungary