Stalin's position gave him an advantage over his
As head of the Control Commission, Stalin had the power to control Party membership.
As the General Secretary, he had the power to appoint people to posts at every level of the Party. This allowed him to win favour and support of those who were given jobs.
Disunity among Stalin's opponents
Their differences and rivalries gave Stalin an opportunity to set them against each other and prevent them from uniting against him.
Differences between Trotsky and Stalin
Trotsky believed in 'Permanent Revolution'.
To him, communism could not survive in USSR alone as the western capitalist countries would one day destroy it.
To prevent this, USSR should first spread communism to other parts of the world and gain support against the capitalist countries.
Stalin put forward 'Socialism in one country'
He argued that USSR should come first before other countries
They should concentrate on building up the Russian economy and not waste money on helping revolutionary groups abroad.
With a strong Russian economy, the capitalist countries would not dare to attack USSR.
Stalin's theory was more appealing to most Russians who had a strong sense of pride in their country and believed that they should concentrate on solving economic problems and strengthen themselves before worrying about spreading communism in other countries.