The flag was green, Snowball explained, to represent the green fields of England, while the hoof and horn signified the future Republic of the Animals which would arise when the human race had been finally overthrown.
In April, Animal Farm was proclaimed a Republic, and it became necessary to elect a President.
The Republic of the Animals which Major had foretold, when the green fields of England should be untrodden by human feet, was still believed in.
There are no more uses of "republic" in the book.
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The United States and each of its states are republics.