What three important changes have occured on Animal Farm after Snowball leaves?

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eabettencourt eNotes educator| Certified Educator

After Snowball leaves, the door for Napoleon to take over is wide open!  And so he does, proceeding to implement many changes on Animal Farm, including doing away with Sunday meetings, breaking more and more commandments, such as "No animal shall drink alcohol," and beginning to trade with humans to fund the windmill which he so adamantly opposed while Snowball was still on the farm, but quickly changes sides once Snowball has been exiled.