If you are talking about the 1917 one, then what happened is that monarchy rule ended since the soviets, that is the Bolsheviks, took over the government and executed the royalty, declaring the party of the people as the only one who is allowed to rule the country since it represented the will of the people. The soviet union was established this way.
The Partition of India proposed by Muhammad Ali Jinnah was based on ethnic lines, although it should be noted that the main line was through religion.
