The correct answer to this open question is the following.
Lenin died on July 21, 1924. After all the activities that Lenin did, he left a legacy but his death also represented a transition period to another political situation that changed the life of Russia. Divisions, political disagreements, and differences followed Lenin's death and Russia lived moments of tension and uncertainty. There were many internal fractions in the Central Committee. After Lenin's death, Joseph Stalin, who had been the General Secretary of the Central Committee in the Communists party, increased his power and influence over rivals, included Trotsky, to be named the Prime of the Soviet Union.