Why did the Bolsheviks win the Civil War?

RUSSIAN CIVIL WAR

The Bolsheviks' enemies – called 'the 'Whites' – joined together to try to bring down the Revolution.
However, the disunity of the 'Whites, and the ruthlessness of the Bolsheviks ('the Reds') meant that the Revolution survived.

Reasons for
(a) the success of Bolsheviks in the Civil War OR
(b) the defeat of Whites in the Civil War

1. Whites is disunited
2. Brilliant Trotsky
3. Belief of communism
4. Implementation of War Communism

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Reference: http://www.johndclare.net/ER3.htm

But why did the Russian Civil War broke out in the first place?

There were three reasons why Civil War broke out in Russia in 1918:

(1) The Bolsheviks (the Reds) had many enemies:
- the Social Revolutionaries (angry because Lenin had closed the Assembly);
- supporters of the Provisional Government;
- supporters of the Tsar;
- army officers (angry that had Lenin had made peace with Germany);
- nobles whose land had been given to the peasants.
These groups co-operated, forming 'the Whites' to try to bring down the Bolshevik government.

(2) the Czech Legion – Czech prisoners of war who mutinied, took control of the Siberian Railway, and attacked towards Moscow.

(3) Britain, America and France, angry that Russia had dropped out of the First World War, attacked the Bolsheviks. They were afraid because the Bolsheviks wanted to cause communist revolutions all over the world.

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Reference: http://www.johndclare.net/ER2.htm