Whats the biggest difference between a empire and republic?

republic is a state where sovereignty rests with the people and a empire is a political unit having an extensive territory or comprising a number of territories or nations and ruled by a single supreme authority.

Explanation:

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lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

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