The passage primarily highlights the following details or events relating to the Russian Revolution:
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The development of communism - The passage discusses the system of thought known as Animalism, which parallels the development of communism as a political ideology during and after the Russian Revolution.
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Stalin’s rise to power after the Russian Revolution - The difficulty the pigs face in persuading the other animals to embrace Animalism reflects the challenges that early communist leaders faced in consolidating power and promoting their ideology, eventually leading to Stalin's rise.
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Those who preferred life under the tsar - The animals' loyalty to Mr. Jones and their reluctance to embrace the idea of rebellion signify the sentiments of those who resisted the revolutionary changes, akin to individuals who preferred the status quo under the tsar.
These options together illustrate the struggle for ideological acceptance and the complexities of revolution.