What is/are the main reason of ideological dispute that prevents unification of the communists parties?

Question

What is/are the main reason of ideological dispute that prevents unification of the communists parties?

Answer 1

Great question! This is sort of like asking why a Democrat in Vermont sounds or votes differently from a Democrat in Texas. In short, the regional history, culture, and voting attitudes matter considerably. Outside factors also had not insignificant weight like American containment. Poland, Czechoslovakia, and other states had not been controlled by an oppressive force prior to the USSR. National, including cultural, identities are highly polarizing and can help motivate an underdog in conflict, ex: the Prague Spring and the dramatic fall of Ceacescu in Romania. These attitudes persisted in various states from the 60s onward until the fall of the Soviet Union.