2.)how did squealer convince the animals that no rule against trade with the humans had never existed?
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Squealer convinced them by blaming Snowball for spreading rumors and pointing out the fact that there was no record of such a rule in written form.
Afterwards Squealer made a round of the farm and set the animals’ minds at rest. He assured them that the resolution against engaging in trade and using money had never been passed, or even suggested. It was pure imagination, probably traceable in the beginning to lies circulated by Snowball. A few animals still felt faintly doubtful, but Squealer asked them shrewdly, ‘Are you certain that this is not something that you have dreamed, comrades? Have you any record of such a resolution? Is it written down anywhere?’ And since it was certainly true that nothing of the kind existed in writing, the animals were satisfied that they had been mistaken.