Best answer will get Why did Stalin win the power struggle against Trotsky to be the leader of the Soviet Union by 1929?

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Structure:

→ Introduction
→ Weaknesses and mistakes of Trotsky and factors that went against him character and why the other leading communists feared him?
→ Stalin s luck and Trotsky falling ill
→ Policies of Stalin and his idea of Socialism in one country as against Permanent Revolution.
→ Explaining why Stalin eventually won.
→ Conclusion