Why did the animals continue to believe in Animal Farm?

Answer 1

Psychological warfare, intimidation, violence, deception, getting rid of all their enemies, good public relations' work and being smarter and having better memories than all of the other animals, except maybe Benjamin.

Answer 2

because the pigs would always say,"if you don't listen Jones will come back, and you don't want that do you?" so of course all of the animals listened and all followed Napolean

Answer 3

Because Napoleon is always right.