How does the conflict in the Animal Farm excerpt relate to the events in the historical passage?
O Snowball's quick escape under the hedge is similar
to how Stalin was expelled.
O Snowball's ideas about work relate to the Stalin's
efforts to gain total control.
O Napoleon removes Snowball for his own purposes
just as Stalin removed those in his own party.
O Snowball's dream for the animals on the farm is the
same as the dream of the Communist Party.

Napoleon removes Snowball for his own purposes  just as Stalin removed those in his own party.

Explanation:

Animal Farm by George Orwell is an allegory to the events in the Soviet Union after the death of Lenin led to a power struggle between Trotsky and Stalin.

Napoleon and Snowball in the book have different views on how to proceed after they had seized the farm just like Stalin and Trotsky did after the death of Lenin. This led to Napoleon deceitfully getting rid of Snowball just as Stalin got rid of Trotsky.

right angles are formed by perpendicular lines. if the lines would extend, to make two intersecting lines, they would form four right angles.