What was the cause of the bolshevik establishment of the union of soviet socialist republics?
a. after victory in the russo-japanese war, russia had gained a significant amount of new territory.
b. revolutionary leader vladimir lenin promised to solve russia’s economic problems through communism.
c. the red army had sided with revolutionaries, and a new military and political system had to be established.
d. white army leader alexander kerensky signed a peace treaty with the allied powers.